mathematics MCQs
Showing 50 questions (Total: 16798)
It takes Rumi 15 minutes to inspect a machine and Sami needs 18 minutes to inspect a machine. They both start inspecting machines separately at 9:00 AM. At certain points of time, both of them will finish inspecting a machine at the same time. When will this occur for the first time?
Correct Answer:
C: 10:30 AM
Explanation:
It takes Rumi 15 minutes to inspect a machine and Sami needs 18 minutes to inspect a machine. They both start inspecting machines separately at 9:00 AM. At certain points of time, both of them will finish inspecting a machine at the same time. When will this occur for the first time? Correct Answer 10:30 AM LCM of 15 & 18 are 90Here 90 minutes = 1 hour 30 minutesSo, inspecting machine at the same time will be = 9:00 AM + 1 hour 30 minutes = 10:30 AM (Ans)
In an examination there ere 60 multiple choice questions. For every right answer 1 point is added and for every wrong answer 0.25 points are deducted from the total. No point is added or deducted for any unanswered question. An applicant answered 75% of the total number of questions and got a total point of 30. How many answers of the applicant were correct?
Correct Answer:
B: 33
Explanation:
In an examination there ere 60 multiple choice questions. For every right answer 1 point is added and for every wrong answer 0.25 points are deducted from the total. No point is added or deducted for any unanswered question. An applicant answered 75% of the total number of questions and got a total point of 30. How many answers of the applicant were correct? Correct Answer 33 Let the number of correct answers be X. Total number of questions answered = 75% of 60 = 45 Now, X - (45 - X)×0.25 = 30 or, X - 45×0.25 + 0.25X = 30 or, 1.25X = 30 + 0.45×25 = 30 + 11.25 = 41.25 or, X = 41.25/1.25 = 33
In a certain English class, 1/4 of the number of girls is equal to 1/6 of the total number of students. What is the ratio of the number of boys to the number of girls in the class?
Correct Answer:
C: 1:2
In a village the growth rate of population is 5% every year. There are 1600 people in the beginning of 2008 what will be the approximate number of people in the beginning of 2011?
Correct Answer:
A: 2012
The average daily income of Mr. A and Mr. B is Tk. 350, of Mr. B and Mr. C is Tk. 365, and of Mr. A and Mr. C is Tk. 340. What is the weekly income of Mr. A if he works 5 days in a week?
Correct Answer:
B: Tk. 1,625
Explanation:
The average daily income of Mr. A and Mr. B is Tk. 350, of Mr. B and Mr. C is Tk. 365, and of Mr. A and Mr. C is Tk. 340. What is the weekly income of Mr. A if he works 5 days in a week? Correct Answer Tk. 1,625 Mr. A + Mr. B = 350*2 = 700 tkMr. B + Mr. C = 365*2 = 730 tkMr. A + Mr. C = 340*2 = 680 tk 2(Mr. A + Mr. B+ Mr. C) = 2110 tk (After Summation)Mr. A + Mr. B+ Mr. C = 1055 Now, daily income of Mr. A = 325 tk, Mr. B = 375 tk, Mr. C = 355 tk Weekly income of A (5 days for 1 week) = 325*5 = 1625 tk (Ans)
An employer pays 3 workers X, Y and Z a total of Tk. 610 a week. X is paid 125% of the amount of Y is paid and 80% of the amount of Z is paid. How much does X make a week?
Correct Answer:
A: Tk. 150
A man is in need of money for 120 days. He asked a banker and the banker charger Tk. 360 at the rate of 6%. What was the amount asked for?
Correct Answer:
A: Tk. 16000
How much should you deposit every year in a bank account to receive taka 1,00,00 after 5 years if the annual interest rate is 12%?
Correct Answer:
A: Tk. 13,143
একটি সংখ্যার বর্গ তার বর্গমূলের চেয়ে ১৪ বেশি হলে সংখ্যাটি :
Correct Answer:
গ: ৪
Explanation:
একটি সংখ্যার বর্গ তার বর্গমূলের চেয়ে ১৪ বেশি হলে সংখ্যাটি : সঠিক উত্তর ৪ ধরি, সংখ্যাটি কক২=√ক+১৪৪২=√৪+১৪১৬=১৬
A number consists of two digits. The sum of the digits is 10. If 72 is subtracted from the number, it's digits are interchanged. Find the number.
Correct Answer:
A: 82
Explanation:
A number consists of two digits. The sum of the digits is 10. If 72 is subtracted from the number, it's digits are interchanged. Find the number. Correct Answer 82 ধরি, একক স্থানীয় অংক = ক দশক স্থানীয় অংক = খসংখ্যাটি = ১০খ+কদেওয়া আছে , ক+খ = ১০ ………………..(১) শর্তমতে, ১০খ+ক-৭২ = ১০ক+খ ৯খ-৭২ = ৯ক খ-ক = ৮ ………………….(২)সমীকরণ(১) এবং সমীকরণ(২), যোগ বিয়োগ করে পাই, ক = ১, খ =৯ অতএব, সংখ্যাটি = ১০খ+ক = ১০*৯+১ = ৯১ (উত্তর)
কোনো ত্রিভুজের বাহুগুলোর অনুপাত নিচের কোনটি হলে ত্রিভুজটি একটি সমকোণী ত্রিভুজ হবে?
Correct Answer:
গ: ৯ : ১২ : ১৫
Explanation:
কোনো ত্রিভুজের বাহুগুলোর অনুপাত নিচের কোনটি হলে ত্রিভুজটি একটি সমকোণী ত্রিভুজ হবে? সঠিক উত্তর ৯ : ১২ : ১৫ সমকোণী ত্রিভুজের ক্ষেত্রে,92+(12)2=(15)281+144=225225=225
দুটি বৃত্তের ব্যাসার্ধের অনুপাত ৩ : ২, বৃত্ত দুটির আয়তনের অনুপাত কত হবে?
Correct Answer:
ঘ: ৯ : ৪
Explanation:
দুটি বৃত্তের ব্যাসার্ধের অনুপাত ৩ : ২, বৃত্ত দুটির আয়তনের অনুপাত কত হবে? সঠিক উত্তর ৯ : ৪ বৃত্তের আয়তন হয় না । বৃত্তের ক্ষেত্রফল = πr২ ; এখানে r = বৃত্তের ব্যাসার্ধ । বৃত্তদ্বয়ের ক্ষেত্রফল অনুপাত = π×৩২ : π×২২ = ৯:৪
Harun invested Tk. 10,000 in Grameen Mutual Fund account exactly 3 years ago. The value of the account increased by 10% during the first year, increased by 5% in the second year and decreased by 10% during the third year. What is the value of the account today?
Correct Answer:
B: Tk. 10,395
একটি দ্রব্য ২৫% লাভে বিক্রয় করা হলে, বিক্রয়মূল্য ও ক্রয়মূল্যের অনুপাত নিচের কোনটি?
Correct Answer:
ক: ৫ : ৪
Explanation:
একটি দ্রব্য ২৫% লাভে বিক্রয় করা হলে, বিক্রয়মূল্য ও ক্রয়মূল্যের অনুপাত নিচের কোনটি? সঠিক উত্তর ৫ : ৪ ক্রয়মূল্য ১০০ টাকা হলে,২৫% লাভে বিক্রয়মূল্য = ১০০+২৫ = ১২৫ টাকাসুতরাং বিক্রয়মূল্য : ক্রয়মূল্য = ১২৫ : ১০০ = ৫ : ৪ ( ২৫ দ্বারা কাটা)
In Dhaka city 90% of the populating own a car, 15% own a motorcycle, and everybody owns one or the other or both. What is the percentage of motorcycle owners who own cars?
Correct Answer:
A: 33%
Towns A and C are connected by straight highway which is 60 miles long. The straight-line distance between town A and town B is 50 miles, and the straight-line distance from town B to town C is 50 miles. How many miles is it from town B to the point on the highway connecting towns A and C which is closest to town B?
Correct Answer:
A: 30
একটি স্কুলে মোট ৫৪০ জন ছাত্রের মধ্যে কোন এক বুধবারে ১৭ জন অনুপস্থিত ছিলো। ঐদিন শতকরা কতজন ছাত্র উপস্থিত ছিলো?
Correct Answer:
ক: ৯৫%
Explanation:
একটি স্কুলে মোট ৫৪০ জন ছাত্রের মধ্যে কোন এক বুধবারে ১৭ জন অনুপস্থিত ছিলো। ঐদিন শতকরা কতজন ছাত্র উপস্থিত ছিলো? সঠিক উত্তর ৯৫% উপস্থিত ছিলো = ৫৪০-১৭ = ৫২৩ জনশতকরা উপস্থিত ছিলো = ৫২৩×১০০৫৪০ = ৯৬.৮৫২ জন (উত্তর)
একটি রাশি অপর রাশির ৬৪% হলে, রাশি দু’টির অনুপাত কত?
Correct Answer:
খ: ১৬ : ২৫
Explanation:
একটি রাশি অপর রাশির ৬৪% হলে, রাশি দু’টির অনুপাত কত? সঠিক উত্তর ১৬ : ২৫ ধরি, একটি রাশি = অপর রাশি = এর ৬৪%। ⇒x = ৬৪১০০⇒x = ১৬২৫∴x = ১৬২৫ = ১৬∶২৫
If x=-1, which of the following has the largest value?
Correct Answer:
A: 2x
Explanation:
If x=-1, which of the following has the largest value? Correct Answer 2x 1. 2×(-1)=-22. 4×(-1)=-43. 8×(-1)=-84. -½=-0.55. -¼=-0.25 (largest value).
If A : B = 5 : 4 and A : C = 6 : 5, then C : B = what?
Correct Answer:
B: 25 : 24
1/4 of Ram's money is equal to 1/6 of Shyam's money. If both together have Tk. 600 the difference between their amounts is-
Correct Answer:
B: 120
Explanation:
1/4 of Ram's money is equal to 1/6 of Shyam's money. If both together have Tk. 600 the difference between their amounts is- Correct Answer 120 Let, ram's money= a Sham's money=b According to the ques, ¼(a) = 1/6(b) => (1/4)/(1/6)= b/a => 6/4= b/a=>a:b= 4:6 Sum of the ratio number= 4+6=10 Ram's money, a= 600*4/10=240 Sham's money, b= 600*6/10=360Difference between their aamount of money= (360-240)=120. Correct ans: option b= 120
It is given that the weight of an empty box is 1000 gm and the total weight of the box when filled with apples and mangoes is 10 kg. If there are 3 dozens of apple in the box and the weight of each apple is 200 gm whereas the weight of every mango is 300 gm. then , find out the total number of mangoes in the box.
Correct Answer:
A: 6
Explanation:
It is given that the weight of an empty box is 1000 gm and the total weight of the box when filled with apples and mangoes is 10 kg. If there are 3 dozens of apple in the box and the weight of each apple is 200 gm whereas the weight of every mango is 300 gm. then , find out the total number of mangoes in the box. Correct Answer 6 Box + apple + mangoes = 10 kg Box = 1000 gm = 1 kg(Doing Subtraction), apple + mangoes = 9 kgTotal apples weight = 3 dozens* 200 gm = 3*12*200 = 7200 gm = 7.2 kgNow, Total mangoes weight = 9-7.2 = 1.8 kg = 1800 gm So, the total number of mangoes in the box = 1800/300 = 6 (Ans)
If the scale used for drawing a map states that the actual distance of 50 km is represented by 1 cm on the map, then according to this scale what will be the actual distance between los Angeles and Washington D.C if Washington D.C if Washington D.C is 12.22 cm away form America on the map?
Correct Answer:
A: 611 km
Explanation:
If the scale used for drawing a map states that the actual distance of 50 km is represented by 1 cm on the map, then according to this scale what will be the actual distance between los Angeles and Washington D.C if Washington D.C if Washington D.C is 12.22 cm away form America on the map? Correct Answer 611 km given that, 1 cm = 50 km so, 12.22 cm = 50 * 12.22km = 611 km
কোনো ত্রিভুজের বাহুগুলোর অনুপাত নিম্নের কোনটি হলে, একটি সমকোণী ত্রিভুজ আঁকা যাবে?
Correct Answer:
খ: ৩ : ৪ : ৫
তিনটি মৌলিক সংখ্যার গুণফল ১৭২৯ এবং এর মধ্যে দুটির গুণফলের দ্বিগুণ হল ১৮২। তৃতীয় সংখ্যাটি কত?
Correct Answer:
ক: ৩
Explanation:
তিনটি মৌলিক সংখ্যার গুণফল ১৭২৯ এবং এর মধ্যে দুটির গুণফলের দ্বিগুণ হল ১৮২। তৃতীয় সংখ্যাটি কত? সঠিক উত্তর ৩ ১৭২৯/(১৮২÷২)=১৯
If 1 +1/x =2 -2/x , then x =
Correct Answer:
A: -1
A group of kittens went on sale and 2/3 of them were sold for Tk. 2.30 each. If none of the 36 remaining kittens were sold, what was the total amount Tk. received for the kittens that were sold?
Correct Answer:
A: 180
Explanation:
A group of kittens went on sale and 2/3 of them were sold for Tk. 2.30 each. If none of the 36 remaining kittens were sold, what was the total amount Tk. received for the kittens that were sold? Correct Answer 180 সম্পূর্ণ Kitten = 1 অংশ তাহলে (1 - 23) অংশ = 36 13 " = 36 so 1 অংশ = 108টি kitten কিন্তু বিক্রি হয়েছে (108 - 36) = 72 টি kitten Total amount = 72 × 2.30 = 165.6 Tk.
When Ehsan was preparing to make a tape from some of his favourite songs, he notices that the Hadi's song was 1 minute longer than Bonna's song and Niaj's song was 1 minute less than twice as long as Bonna's song. If the total time for these three songs is 12 minutes, how long is Niaj's song?
Correct Answer:
C: 5 minute
The elevator in an eleven-storied office building travels at the rate of one floor per 1/4 minute, which allows time for picking up and letting down passengers. At the main floor and at the top floor the operator stops for 1 minute. How many complete (return) trips will the operator make during a 7 hours period?
Correct Answer:
B: 60
Arman wanted to have Tk. 39,200 , as interest after 5 years . He has invested an amount in an account for 1 year at 8% interest rate. From the 2nd year he invested the principal amount in another account in another account at the rate of 11% . what was the principle amount ?
Correct Answer:
B: Tk. 80,000
Explanation:
Arman wanted to have Tk. 39,200 , as interest after 5 years . He has invested an amount in an account for 1 year at 8% interest rate. From the 2nd year he invested the principal amount in another account in another account at the rate of 11% . what was the principle amount ? Correct Answer Tk. 80,000 ধরি, principal amouut x তাহলে, x × 8100×1 + x×10100x3 + x×11100×1 = 39200 so x = 39200.08 + .10×3 + .11 = 80000
যদি একটি সংখ্যার ৩০ শতাংশের ১৫ শতাংশ ১৮ হয় , তবে সংখ্যাটি কত?
Correct Answer:
ক: ৯
Explanation:
যদি একটি সংখ্যার ৩০ শতাংশের ১৫ শতাংশ ১৮ হয় , তবে সংখ্যাটি কত? সঠিক উত্তর ৯ ধরি, সংখ্যা দুটি যথাক্রমে ৫x ও ৮x প্রশ্নমতে, ৫x + ২৮x + ২ = ২৩ বা, ১৬x + ৪ = ১৫x + ৬ বা, x = ২ ∴ সংখ্যা দুটি যথাক্রমে ৫×২ = ১০ ও ৮×২ = ১৬।
নয়ন একটি কাজ ১ ঘন্টায় করতে পারে। একই কাজ আরিফ ২ ঘন্টায় ও সুমন ৩ ঘন্টায় সম্পন্ন তরতে পারে। কাজটি ৩ জনে একত্রে সম্পন্ন করতে লাগবে-
Correct Answer:
ক: ১/২ ঘন্টা
Explanation:
নয়ন একটি কাজ ১ ঘন্টায় করতে পারে। একই কাজ আরিফ ২ ঘন্টায় ও সুমন ৩ ঘন্টায় সম্পন্ন তরতে পারে। কাজটি ৩ জনে একত্রে সম্পন্ন করতে লাগবে- সঠিক উত্তর ১/২ ঘন্টা ৯, ৩৬, ৮১, ১৪৪, ……. এখানে, ৩২ = ৯৬২ = ৩৬৯২ = ৮১১২২ = ১৪৪∴১৫২ = ২২৫ যেহেতু ৬ - ৩ = ৩৯ - ৬ = ৩১২ - ৯ = ৩∴১৫ - ১২ = ৩
How many years does it take for interest Tk. 1000 to become equal to the interest to the interest on Tk. 20 in 8 years?
Correct Answer:
A: 20
Explanation:
How many years does it take for interest Tk. 1000 to become equal to the interest to the interest on Tk. 20 in 8 years? Correct Answer 20 এখানে rate দেয়া নাই।
To produce an old photograph, a photographer charges x dollars to make a negative 3x/5 dollars for each of the first 10 prints, and x/5 dollars for each print in excess of 10 prints. If 45 dollars is the total charge to make a negative and 20 prints from an old photograph, how many dollars the photographer charges to make a negative?
Correct Answer:
A: 3
Explanation:
To produce an old photograph, a photographer charges x dollars to make a negative 3x/5 dollars for each of the first 10 prints, and x/5 dollars for each print in excess of 10 prints. If 45 dollars is the total charge to make a negative and 20 prints from an old photograph, how many dollars the photographer charges to make a negative? Correct Answer 3 To reproduce an old photograph, a photographer charges x dollars to make a negative, 3x/5 dollars for each of the first 10 prints, and x/5 dollars for each print in excess of 10 prints. If $45 is the total charge to make a negative and 20 prints from an old photograph, what is the value of x?Answer: a negative charge=xfirst 10 prints charge= 10*3x/5=30x/5 = 6xother 10 prints charge= 10*x/5=10x/5=2xx+6x+2x = 459x = 45x = 5
Mr. Jaman is insured completely for Tk. 1,50,000 against damages to his machinery. For any damage over Tk. 1,50,000 the insurance company will pay Tk. 1,50,000 plus only 15% of the additional damage. For a recent accident, Mr. Jaman was paid Tk. 1,56,000 by the insurance company. What was the total amount of the damage estimated?
Correct Answer:
A: Tk. 1,04,000
Of the 45 families in a locality, 25 families have working mothers and 10 families have retired individuals as members to look after the children at home. Of the families, 8 have both working mothers and retired individuals as members. How many of the families have working mothers but no retired individuals as members?
Correct Answer:
C: 17
In the coordinate plane, for which one of the following values of x would graph of the equation y=x3-x2-6x not touch the x-axis?
Correct Answer:
Correct Answer:
A truck covers a distance of 550 metres in 1 minute where as a bus covers a distance of 33 kms in 45 minutes. The ratio of their speeds is :
Correct Answer:
A: 3 : 4
Explanation:
A truck covers a distance of 550 metres in 1 minute where as a bus covers a distance of 33 kms in 45 minutes. The ratio of their speeds is : Correct Answer 3 : 4 In the case of truck S = 550m/60 = 9.166 = 9 m/sec In the case of Bus S = ( 33×1000)m /( 45×60)sec = 12 m/sec So the speed ratio of truck : Bus = 9 : 12 = 3 : 4
যদি y/x=1/2 এবং x+2y=10 হয় তাহলে x=?
Correct Answer:
ক: 2
Explanation:
যদি y/x=1/2 এবং x+2y=10 হয় তাহলে x=? সঠিক উত্তর 2 y/x = 1/3 বা, x = 3y এখন, x + 2y = 10 বা, 3y + 2y = 10 বা, 5y = 10 বা, y = 10/8 = 2 বা, x = 3 × 2 = 6
যদি ১৭/২৪, ১/২, ৩/৮, ৩/৪ এবং ৯/১৬ সংখ্যাগুলো বৃহত্তম হতে ক্ষুদ্রতমভাবে সাজানো হয়, তাহলে মাঝখানের সংখ্যাটি কত হবে?
Correct Answer:
ক: ১৭/২৪
Akash bought two varieties of rice, costing Tk. 50/kg each, and Tk. 60/kg each, and mixed them in some ratio. Then he sold the mixture at Tk. 70/kg. making a profit of 20%. What was the ratio of the mixture?
Correct Answer:
B: 1 : 5
Explanation:
Akash bought two varieties of rice, costing Tk. 50/kg each, and Tk. 60/kg each, and mixed them in some ratio. Then he sold the mixture at Tk. 70/kg. making a profit of 20%. What was the ratio of the mixture? Correct Answer 1 : 5 Let, he bought x kg at 50/kg rate y kg at 60/kg rate So, the cost price = 50x + 60y and sell price = 70 ( x + y) Now, the profit was 20% if cost price is 100 selling is 120 tk if cost price (50x + 60y) selling is 120( 50x + 60y)/100 120(50x + 60y)/100 = 70(x + y) 60x + 72y = 70x + 70y 2y = 10x 5x = y x/y = 1/5 x : y = 1 : 5
একটি লোক বছরের অন্যান্য মাসে যা উৎপাদন করে আগস্ট মাসে তার দ্বিগুণ উৎপন্ন করে। আগস্ট মাসে তা উৎপাদনের পরিমাণ অন্যান্য মাসের কত ভাগ?
Correct Answer:
ক: ১/১২
Explanation:
একটি লোক বছরের অন্যান্য মাসে যা উৎপাদন করে আগস্ট মাসে তার দ্বিগুণ উৎপন্ন করে। আগস্ট মাসে তা উৎপাদনের পরিমাণ অন্যান্য মাসের কত ভাগ? সঠিক উত্তর ১/১২ আগস্ট মাসে উৎপাদন করে = ২ ভাগ বাকি ১১ মাসে উৎপাদন করে = ১১ ভাগ আগস্ট মাসের উৎপাদন অন্যান্য মাসের উৎপাদনের = ২/১১ ভাগ।
A survey of n people in the town A found that 50% of them prefer Brand X. Another survey of 100 people in the town B found that 60% prefer Brand X. In total, 55% of all the people surveyed together prefer Brand X. What is the total number of people surveyed?
Correct Answer:
D: 200
Explanation:
A survey of n people in the town A found that 50% of them prefer Brand X. Another survey of 100 people in the town B found that 60% prefer Brand X. In total, 55% of all the people surveyed together prefer Brand X. What is the total number of people surveyed? Correct Answer 200 Total = n + 100 Now, total × 55% = n × 50% + 100× 60% ( n + 100) ×.55 = . 50n + 60 .55n + 55 = .50n + 60 .05n = 5 n = 5/.05 = 100 Total = n + 100 = 100 + 100 = 200
In a class, 120 students are male and 100 students are female. 25% of the male students and 20% of the female students are engineering students. 20% of the male engineering students and 25% of the female engineering students passed the final exam. What percentage of engineering students passed the exam?
Correct Answer:
D: 22%
Explanation:
In a class, 120 students are male and 100 students are female. 25% of the male students and 20% of the female students are engineering students. 20% of the male engineering students and 25% of the female engineering students passed the final exam. What percentage of engineering students passed the exam? Correct Answer 22% Eng. male = 120×.25 = 30 Eng.female = 100×.20 = 20 Total eng. student = 30 + 20 = 50 Eng.male passed = 30×.20 = 6 Eng female passed = 20×.25 = 5 So, percentage passed = (6 + 5)/50×100% = 22%
যদি কিউব-ক এর সাইড ও কিউব-খ এর সাইডের অনুপাত ২ : ১, তা হলে এর তল দুটির অনুপাত কত?
Correct Answer:
গ: ৪ : ১
৫:১৮, ৭:২ এবং ৩:৬ এর মিশ্র অনুপাত কত?
Correct Answer:
গ: ৩৫:৭২
Explanation:
৫:১৮, ৭:২ এবং ৩:৬ এর মিশ্র অনুপাত কত? সঠিক উত্তর ৩৫:৭২ অনুপাত তিনটি হল যথাক্রমে = ৫:১৮,৭:২,৩:৬ অনুপাত গুলোর প্রথম অংশের লসাগু = ১০৫ ২য় অংশের ল সা গু = ৭২ নির্ণেয় মিশ্র অনুপাত = ১০৫ :৭২
A and B started a partnership business investing some amount in the ratio of 3 : 5. C joined them after six months with an amount equal to that of B. In what proportion should the profit at the end of one year be distributed among A, B and C?
Correct Answer:
C: 6 : 10 : 5
Explanation:
A and B started a partnership business investing some amount in the ratio of 3 : 5. C joined them after six months with an amount equal to that of B. In what proportion should the profit at the end of one year be distributed among A, B and C? Correct Answer 6 : 10 : 5 Hints: Let the initial investments of A and B be 3x and 5x A : B : C = (3x × 12) : ( 5x × 12) : ( 5x × 6) = 36 : 60 : 30 = 6 : 10 : 5
If the income of A is 10% more than that of B and the income of B is 20% less than that of C, then the income of A, B and C respectively are in the ratio
Correct Answer:
B: 22 : 20 : 25
Explanation:
If the income of A is 10% more than that of B and the income of B is 20% less than that of C, then the income of A, B and C respectively are in the ratio Correct Answer 22 : 20 : 25 ধরি, C এর ইনকাম 100 টাকা B এর ইনকাম ( 100 - 100 এর 20%) = 80 টাকা A এর ইনকাম ( 80 + 80 এর 10 %) = 88 টাকা। A : B : C = 88 : 80 : 100 = 22 : 20 : 25
In what ratio must a grocer mix two varieties of tea worth TK. 60 a kg and TK. 65 a kg so that by selling the mixture at TK. 68.20 a kg he may gain 10% ?
Correct Answer:
A: 3:2
Explanation:
In what ratio must a grocer mix two varieties of tea worth TK. 60 a kg and TK. 65 a kg so that by selling the mixture at TK. 68.20 a kg he may gain 10% ? Correct Answer 3:2 Hints : Let he mixes the tea in ratio x:y Therefore the cist price = 60x + 65y selling price = 68.20(x + y) we know, profit = sells price - cost price 10% of (60x + 65y) = 68.20(x + y) - (60x + 65y) 10(60x + 65y) / 100 = 68.20x + 68.20y - 60x - 65y 6x + 6.5y = 820x + 3.20 y 2.2x = 3.3 y x/y = 3/2 x:y = 3:2
Two whole numbers whose sum is 72 cannot be in the ratio :
Correct Answer:
C: 3 : 4
Explanation:
Two whole numbers whose sum is 72 cannot be in the ratio : Correct Answer 3 : 4 A. 5 : 7 5x + 7x = 72 12x = 72 x = 6 B. 3 : 5 3x + 5x = 72 x = 9 C. 3 : 4 3x + 4x = 72 x = 72/7 D. 4:5 4x + 5x = 72 x = 8