Explanation:

Last year there were 1172 students at Gulshan High school. This year there are 15 percent more students than last year. Approximately how many students are at Gulshan High School this year? Correct Answer 1348 Number of students this year = 1172 + 15% of 1172 =   1172 + 175.8 ≈ 1348

Explanation:

What percentage of profit is made by selling an article at a certain price if by selling at two third of that price there would be a loss of 20%? Correct Answer 20% Let the cost price and sell price be A and S respectively. ATQ,   (A - 2S/3) /A = 20/100 or,  (A - 2S/3) / A = 1/5 or, (A - 2S/3) = A/5 or, 2S/3 = A - A/5 or, 2S/3 = 4A/5 or, S = 4A/5 × 3/2 or, S = 6A/5 Now, profit = (S - A) / A × 100%   = (6A/5 - A) / A × 100% = (A/5) / A × 100% =  20%

Explanation:

Income of A is 25% less than B. How much percent B's income would be more than that of A? Correct Answer 33.5% Let their income be A and B respectively. Now,  A = B - 25% of B = B - B/4 = 3B/4 or,  B = 4A/3 Now,  B - A = 4A/3 - A = A/3 = A/3 × 100% = 33.33% of A

Explanation:

A batsman in his 17th innings makes a score of 85 and thereby increases his average by 3, his average after the 17th innings is : Correct Answer 37 Let the average of the first 16 innings be A. Total of the 16 innings = 16A New average = A + 3 New total of 17 innings, 17(A + 3) = 16A + 85 or,  17A + 51 = 16A + 85 or,  17A - 16A = 85 - 51 or, A = 34 So, new average after 17th innings = A + 3 = 34 + 3 = 37

Explanation:

If the length of a rectangle is increased by 20% and the width is decreased by 20%, then the area is : Correct Answer decreased by 4% We can let L = the original length and W = the original width Thus, the original area of the rectangular is LW and the new area is 1.2L× 0.8W = 0.96LW So, the area is decreased by 4%

Explanation:

A towel, when bleached, was found to have lost 20% of its length and 10% of its breath . what is the percentage of decrease in area? Correct Answer 28% Let, original length = x and original breadth = y Decrease in area = xy - ( 80x/100×90y/100) = ( xy - 18xy/25) = 7xy/25 Decrease % = ( 7xy/25 ×1/xy ×100%) = 28%

Explanation:

A tree increases annually by 1/8 of its height. By how much will it increase after 2 years, if it stands today 64 cm high? Correct Answer 81 cm প্রতি বছর height এর 18 বাড়ে ১ম বছর পরে height = 64 + 64×18 = 64 + 8 = 72 cm ২য় বছর পরে = 72 + 72×18 = 72 + 9 = 81 cm

Explanation:

If w is 10% less than x, and y is 30% less than Z, then why is what percent less than xz? Correct Answer 37% w = x - 10% of x w = .9x and y = z - 30% of z = .7z ⸫ wy = .63xz = (1 - .37)xz অর্থাৎ 7% less

Explanation:

One dozen of eggs and ten pounds of apples are currently of the same price. If the price of egg increase by 10% and the price of apple increase up by 2% how much more will it cost to buy a dozen of eggs and ten pounds of apples? Correct Answer 6% Let the price of one dozen of eggs and ten pounds of apples be P tk each.   So, total cost of one dozen of eggs and ten pounds of applles = P + P = 2P tk New price of one dozen of eggs = P + 10% of P = P + 0.1P = 1.1P New price of ten pounds of apples = P + 2% of P = 1.02P Total new price of one dozen of eggs and ten pounds of apples = 1.1P + 1.02P = 2.12P Price increase = (2.12P - 2P)/2P×100% = 6%

Explanation:

If 40% of all women are voters and 52% of the population are women, what percent of the population are female avoters? Correct Answer 20.8 মনে করি, মোট জনসংখ্যা = 100 জন Women দের সংখ্যা = 52 জন Women দের ভোটার সংখ্যা = 52×(40/100) = 20.8

Explanation:

The average age of 40 employees in a branch of a bank is 35 years . When a new employee joined the bank the average age increased to 35.5 years. What is the age of the new employee ? Correct Answer 55.5 Total age of 40 employees = 40×35 = 1400 years Total age of 41 employees = 41×35.5 = 1455.5 years Age of the new employee = 1455.5 - 1400 = 55.5 years

Explanation:

A glass was filled with 10 liters of water and 0.01 liter of water evaporated every day during a 20-day period . What percent of the original amount of water evaporated during the period ? Correct Answer 2% Total water evaporated = 0.01×20 = 0.2 liter Percentage of evaporated water = 0.2 / 10 × 100% = 2%

Explanation:

In a university, 80 percent of the students lived in hostel, and 60 percent of the hostel students are lucky to get a single room. If number of lucky students is 1200, then how many students were there in the university? Correct Answer 2500 Let, total No. of students = x No. of students lived in hostel = x × 80% = 0.8x No.of Lucky students = 0.8x × 60% = 0.8x × 0.6 = 0.48x According to question, 0.48x = 1200 x = (1200 ×100)/048 x = 2500

Explanation:

The population of a certain town increases by 50 percent every 50 years. If the population in 1950 was 810 , in year was the population 160? Correct Answer 1750 যেহেতু population 50% increase করে প্রতি 50 বছর, 1950 এর population 150% ছিল অথবা 32of1900 এর population অর্থাৎ 1900 এর population 1950 এর 23 গুণ, আমরা 23 দ্বারা গুণ করে যেতে থাকব যতক্ষণ পর্যন্ত 160 পাওয়া যায়। 1950:810×23 = 540 in 1900; 540×23 = 360 in 1850;  360×23 = 240 in 1800; 240×23 = 160 in 1750

Explanation:

Bus fare recently was increased form Taka 0.85 to Taka 1.00 what was the approximate percentage of increase? Correct Answer 18% increase = 1 - ·85·85×100% = 17·64% = 18%

Explanation:

Every 3 minutes , 4 liters of water are poured into a 2,000 litre tank . After 2 hours, what percent of the tank is full? Correct Answer 8% 2 hour = 120 min 1203 = 40 তাহলে মোট 40 বার পানি ঢালা হয়েছে। percent of the tank full = 40×42000 = 1602000 = ·08 = 8%

Explanation:

The charge of a room at Sheraton is 25% less than that of a room at Westin and 10% less than that of a room at Sonargaon . By what percent is the charge of a room at Westin is greater than that of Sonargaon ? Correct Answer 20% Let the charges at Sherato, Westin and Sonargaon be A, B & C respectively. Now,  A = B - 25% of B = B - 0.25B = 0.75B = 3B/4 or,  B = 4A/3 Again,  A = C - 10% of C = C - 0.1C = 0.9C = 9C/10 or, C = 10A/9 Now,  B - C =  4A/3 -  10A/9 = (12A - 10A) / 9 = 2A/9 Charge at westin is greater than charge at Sonargaon by (2A/9) / (10A/9) × 100% = 20%

Explanation:

একটি স্কুলে মোট ৫৪০ জন ছাত্রের মধ্যে কোন এক বুধবারে ২৭ জন অনুপস্থিত ছিল। ঐদিন শতকরা কত জন ছাত্র উপস্থিত ছিল? সঠিক উত্তর ৯৫% ব্যাখাঃ উপস্থিত ছাত্র = ৫৪০ - ২৭ = ৫১৩ জন শতকরা উপস্থিত = ৫১৩ /৫৪০ × ১০০% = ৯৫%

Explanation:

আজাদ সাহেবের মাসিক বেতন ১৫,০০০ টাকা। এক বছর পর তার বেতন ৭% বৃদ্ধি পেল। বর্তমানে আজাদ সাহেবের মাসিক বেতন কত? সঠিক উত্তর ১৬,০৫০ টাকা ব্যাখাঃ ১৫০০০ + ৭/১০০ × ১৫০০০ = ১৬০৫০ টাকা।

Explanation:

একটি তেল কোম্পানি তাদের তেলের দাম ২৫% বৃদ্ধি করল। তেলের ব্যবহার শতকরা কত কমালে তেল বাবদ খরচের কোনো পরিবর্তন হবে না? সঠিক উত্তর ২০% ব্যাখাঃ ২৫% বৃদ্ধিতে পূর্বমূল্য ১০০ টাকা হলে বর্তমান মূল্য = (১০০ + ২৫) = ১২৫ টাকা ১২৫ টাকায় ব্যবহার কমাতে হবে ২৫ টাকার ১০০ টাকায় ব্যবহার কমাতে হবে ( ২৫×১০০)/১২৫ টাকা = ২০ টাকার অর্থাৎ, ব্যবহার কমাতে হবে ২০%।

Explanation:

চা পাতার উপর কর ১০% কমালে ২৫০০ টাকায় পূর্বাপেক্ষা ৫০ কেজি চা পাতার কর বেশি দেয়া যায়। চা পাতার কর কত টাকা কমেছে? সঠিক উত্তর ২৫০ টাকা ব্যাখ্যাঃ ১০০ টাকায় কমে ১০ টাকা ২৫০০ টাকায় কমে ( ১০×২৫০০)/১০০ = ২৫০ টাকা।

Explanation:

হেলালের মাসিক আয় ৪,২০০ টাকা এবং ব্যয় ২,৯৪০ টাকা। তার মাসিক ব্যয় মাসিক আয়ের শতকরা কত টাকা? সঠিক উত্তর ৭০% ব্যাখাঃ ২৯৪০ / ৪২০০ ×১০০% = ৭০%

Explanation:

A 5% monthly salary increase resulted in a salary increase of TK. 6,000 per year for an employee. What was his monthly salary before the increase? Correct Answer Tk. 10,000 6000 Tk per year increase হলে প্রতি মাসে income = 600012 = 500 tk অথাৎ তার প্রতি মাসের Salary এর 5% হচ্ছে 500 tk. monthly salary x 5% = 500 So,monthly salary = = 500×1005 = 10000

Explanation:

একটি পরীক্ষায় মোট ছাত্রের ৮০% ছাত্র গণিতে এবং ৯০% ছাত্র বাংলায় পাস করলো। উভয় বিষয়ে কোনো ছাত্র ফেল করেনি। ৩৫০ জন ছাত্র উভয় বিষয়ে পাস করে থাকলে, পরীক্ষায় মোট উপস্থিত ছিল? সঠিক উত্তর ৫০০ জন উভয় বিষয়ে পাশ করে = ৮০% + ৯০% - ১০০% = ৭০% ৭০% শিক্ষার্থী = ৩৫০ জন সুতরাং, ১০০% শিক্ষর্থিী = ৩৫০ × ১০০ / ৭০ = ৫০০ জন।

Explanation:

Rice is now being sold at Taka 20 a kg. During last month its rate was Taka 16 per kg . By how much percent should a family reduce its consumption so as to keep the expenditure fixed? Correct Answer 20% ধরি, L এবং T যথাক্রমে Last month এবং This month এর চালের পরিমাণ So, cost last month = 16L; this month = 20T যেহেতু cost একই রাখা হয়েছে,এই দুটি same so, 16L = 20T or, T = .8L অথাৎ This month তারা rice consume করবে, 8 times of last month or 80% So,reduction in consumption = (100 - 80)% = 20%

Explanation:

যদি কোনো বর্গক্ষেত্রের প্রত্যেক বাহুর পরিমাণ ১০% বৃদ্ধি পায়, তবে তার ক্ষেত্রফল শতকরা কতভাগ বৃদ্ধি পাবে? সঠিক উত্তর ২১% বৃদ্বি পাবে = 10 + 10 + 10*10/100 = 21

Explanation:

The average weight of 8 persons increases by 2.5 kg when a new person comes in place of one of them weighing 65 kg . What might be the weight of the new person? Correct Answer 85 kg Total weight increased = (8x2.5)kg = 20kg so,Weight of new person = (65 + 20) = 85kg

Explanation:

Of the fruit that arrives at a cannery, 20 percent by weight is rejected before processing. Of the fruit that is processed, 15 percent by weight is rejected be fore canning. Of the fruit that arrives at the cannery, what percent by weight is canned? Correct Answer 68% Let the amount arrives be F. Remaining before processing = F - 20% of F = 0.8F Remaining after processing = 0.8F - 15% of 0.8F = 0.8F - 0.12F = 0.68F = 68% of F So, amount of food canned =  68%

Explanation:

The price of an item changed from Tk. 120 to Tk. 100. Later, the price decreased again from Tk. 100 to Tk. 80 and finally the price decreased from Tk. 80 to Tk. 60. What oif the three decreases was larger in percentage term? Correct Answer 3rd decrease 1st decrease = (120 - 100)/120×100% = 16.67% 2nd decrease = (100 - 80)/100×100% = 20% 3rd decrease = (80 - 60)/80×100% = 25% So, 3rd decrease was the largest.

Explanation:

A shopkeeper sells 5 mangoes at a price he bought 4 mangoes. What percentage (%) of loss or gain? Correct Answer 20% Let the price of 4 mangoes bought be X. Price per mango bought = X/4 Price per mango sold = X/5 Loss = (X/4 - X/5) / (X/4) × 100% = (X/20) / (X/4) ×100% = 20%

Explanation:

If 40% of all women are voters, and 52% of the population is women, what percent of the population are women voters? Correct Answer 20.8 মনে করি, মোট জনসংখ্যা = 100 জন Women দের সংখ্যা = 52 জন Women দের ভোটার সংখ্যা = 52×(40/100) = 20.8

Explanation:

If an inspector rejects 0.08% of a product as defective, how many products will he examine in order to reject 2? Correct Answer 2500 Inspector rejects 0.08% Let there be x meters. No. if defective maters = 0.08% of x = > 2 = (0.08/100)×x = > (200/0.8) = x = > x = 20000/8​   ∴ x = 2500 ∴ Inspector examines 2500 meters and reject 2

Explanation:

The length of a rectangle is increased by 50%, by what percent would the width have to be decreased to maintain sane area? Correct Answer 33.33 Let, the length of the rectangle be x cm and the breadth of the rectangle y cm Therefore area of the rectangle = x * y = xy cm² as the length is increased by 50% ∴ length = x + 50% of x                   = x + 50/100 *x                   = x + x/2                   = 3x/2 Given that area is constant so, xy = 3x/2 * breadth breadth = 2xy/3x = 2y/3 cm Percentage of increase in breadth = decrease in breadth/original breadth *100                               = (y - 2y/3)/y * 100                               = {(3y - 2y) / 3}/y*100                               = y/3y *100                               = 100/3                               = 33.333% The breadth is decreased by 33.333% (Ans)

Explanation:

C is the midpoint of the line segment AE, B and D are on the line segment AE so that AB=BC and CD=DE, what percentage of AC is AD? Correct Answer 150 A হচ্ছে 40%

Explanation:

A man spends 75% of his income. his income is increased by 20% and he increased his expenditure by 10%. His savings are increased by : Correct Answer 50% Let income = 100 Expenditure : 75 So, saving (100 - 75) = 25 New income = 100 + 20% of 100 = 120 New expenditure = 75 + 10% of 75 = 82.5 New saving = 120 82.5 = 37.5 Increase of saving = 37.5 25 = 12.5 % increase in saving = (12.5/25) × 100 = 50% (ans)

Explanation:

If a commission of 10% is given on the marked price of a book, the publisher gains 20%. If the commission is increased to 15% the gain is : Correct Answer 13.33% Let CP = 100 And Marked price = x SP = x - 10% of x x - 10% of x = 120 x - 10x/100 = 120 9x/100 = 120 9x = 1200 X = 133.33 If 15% Commission was given, then SP = 133.33 - 15% of 133.33 SP = 133.33 - 20 SP = 113.33 Gain = 113.33 - 100 = 13.33% (ans)

Explanation:

The owner of Aarong starts to calculate the percentage of customers who purchase Tagas. if 40% of the total customers who visit the store actually purchase goods and 15% of them purchase tagas, then what percentage of Aarong's customers are Taga buyers? Correct Answer 6% Let the total Customers number = 100 Then Customers who actually purchase goods = 40 And Customers who purchase tagas = 40 × 15/100 = 6 Required percentage = 6%

Explanation:

The price of desktop computer is discounted by 20%, and reduced price is then discounted by 20%. The series of successive discount is equivalent to a single discount of : Correct Answer 36% Let the price of desktop computer be 100 Then after first discount price becomes 80 Then again it is discounted by 20% So the Price Becomes = 80 (80 × 20/100) = 64 So a single discount will be = (100 64) = 36%. (ans)

Explanation:

Of the fruits that arrive at the cannery, 20 percent by weight is rejected before processing. Of the fruit that is processed, 15 percent by weight is rejected before canning. Of the fruit that arrives at the cannery. what percent by weight is canned? Correct Answer 68% Let Fruits arrived at cannery = 100 Selected for processing = 100 20 = 80 Percentage of canned fruits = 80 (80 × 15/100) = 68% (ans)

Explanation:

If x percent of 40 is y, Then 10x equals : Correct Answer 25y x% of 40 = y x = 100y/40 10x = 25y

Explanation:

If 40% of all women are voters and 52% of the population are women, what percent of the population are women voters? Correct Answer 20.8 মনে করি, মোট জনসংখ্যা = 100 জন Women দের সংখ্যা = 52 জন Women দের ভোটার সংখ্যা = 52×(40/100) = 20.8

Explanation:

In redesigning a cold storage, the length is increased by 30% , the breadth is increased by 50% and the height is reduced by 20% . what is the net increase in the volume of the redesigned cold storage compared to the previous design? Correct Answer 56% Let, length, width and height of the cold storage are respectively l, w and h. so, volume = lwh New length = l + 30/100 l = 1.3 l New width = w + 50/100 w = 1.5 w New height = h - 20/100 h = 0.8 h so, new volume = 1.3 l * 1.5w * 0.8 h = 1.56 lwh increase in volume = (1.56 - 1)lwh = 0.56 lwh percentage increase in volume = 0.56 * 100% = 56%.

Explanation:

Four partners distribute their income amongst themselves in the proportions 1:2:3:4. What percent of the income is received by the first partner? Correct Answer 10 Income received by the first person = 1 / (1 + 2 + 3 + 4) × 100% = 10%

Explanation:

B and C are points on a straight line AD, where AB= BC=CD . What percent of AC is AD? Correct Answer 66.7% AC/AD = 2/3 = 2/3 * 100 = 66.70%

Explanation:

what percent of 25 is 0.2 0? Correct Answer 0.8 let x% of 25 is 0.2 so, x/100 * 25 = 0.2 so, x = 0.8

Explanation:

If the radius of a circle is decreased by 30 percent, by what percent will the area of the circular region decrease? Correct Answer 51% Initial radius = R Initial area =  π R2 New radius = R - 30% of R = R - 0.3R = 0.7R New area =  π (0.7R)2 = 0.49 π R2 Decrease in area = (πR2 -   0.49πR2) / (πR2) × 100% = 51%

Explanation:

Out of total profit , A gets 40% , B 25% , c 20% , D 10% and E 5% . what percentage of B's profit is that of A? Correct Answer 160% 40/25 * 100% = 160%