Explanation:

A number,when 35 is subtracted from it, reduces to its 80 percent. What is four-fifth of that number ? Correct Answer 140 Let the number be x. Now, According to question x - 35 = 80% of x ⇒ x - 35 = 80x100 ⇒ x - 80x100 = 35 ⇒100x - 80x100 = 35 ⇒ 20x = 35×100 ⇒x = 35×10020 ⇒ x = 175 ⇒ ∴45x = 140

Explanation:

A student has to obtain 33% of the total marks to pass. He got 125 marks and failed by 40 marks. The maximum marks are : Correct Answer 500 Let the maximum marks be x. Then, 33% of x = 125 + 40 ⇒33100×× = 165 ⇒33x = 165×100 ⇒ x = 165×10033 ∴ x = 500

Explanation:

What percentage of numbers from 1 to 70 have squares that end in the digit 1 ? Correct Answer 20 Squares that end in the digit 1 be number of last digit 1 & 9. So numbers are 1, 9, 11, 21, 29, 31, 39, 41, 49, 51, 59, 61, 69. So total number is 14. ∴ Percentage = 1470×100 = 20

Explanation:

Half of 41 percent written as a decimal is Correct Answer 0.005 ‘ঝি’ – এর সমার্থক শব্দ হলো : সুতা, দুহিতা, তনয়া, মেয়ে, দুলালী, নন্দিনী, আত্মজা।

Explanation:

A sum of money at simple interest amounts to Tk. 815 in 3 tears and to Tk. 854 in 4 years.The sum is : Correct Answer Tk.698 Simple Internet ofr 1 year = Tk. (854 - 815) = Tk. 39 Simple Interest for 3 years  =  Tk. (39×3)  =  Tk. 117∴ Principal or sum  =  Tk. ( 815 - 117) Tk. 698

Explanation:

19.99×9.9+99.9=? Correct Answer 297.80 19.99×9.9 + 99.9 = 197.901 + 99.9 [ দশমিক ছাড়া গুণ করে পরে দশমিক বসাবেন] = 297.801

Explanation:

The cost price of an article is Tk. 7840. What should be the selling price of the article so that there is a profit of 7% Correct Answer Tk. 8388.80 100% = 7840 ∴107% = (7840×107)/100 = 8388.80

Explanation:

The simple interest on a sum of money at 8% per annum for 6 years is half the sum. The sum is : Correct Answer Data inadequate Let, principal amount be x So interest would be x2I = Pnr⇒x2 = x ×n×r⇒12 = n×r = .05×6 = .48 So, data inadequate

Explanation:

4 mat-weavers can weave 4 mats in 4 days. At the same rate, how many mats would be woven by 8 mat-weavers in 8 days? Correct Answer 16 Let the required number of bottles be x more weaves, more mats ( Direct Proportion), more days, more math (Direct Proportion) Weavers 44 88:: 4 : xDays∴4×4×x = 8×8×4⇒x  =  8×8×48×4∴x  = 16

Explanation:

A train 108 m long moving at a speed of 50 km/hr crosses a train 112 m long coming from opposite direction in 6 seconds.The speed of the second train is Correct Answer 82 km/hr ধরি, দ্বিতীয় ট্রেনটির গতি x km/hr 6/60× 60 = (108/1000) + (112 /1000) / x + 50 = > 1/600 = ( 220/1000) / x + 50 = > 1/600 = 22/100( x + 50) = > 1/6 = 22/ x + 50 = > x + 50 = 6 × 22 = > x = 132 - 50 ∴x = 82

Explanation:

36 men can complete a piece of work in 18 days. In how many days will 27 men complete the same work? Correct Answer 24 Let, the required number of days be x. Less man, More days ( Indirect Proportion) ∴27:36::18:x⇒2736 = 18x⇒27x = 18×36⇒x  =  18×3627∴x  = 24

Explanation:

If 7 spiders make 7 webs in 7 days, then 1 spider will make 1 web in how many days? Correct Answer 7 Let the required number days be x. Less spiders, More days (Indirect Proportion) Less webs, Less days (Direct Proportion) Spider 1 ; 7 Webs 7 : 1 ∴1×7×x = 7×1×7 ⇒x = 7

Explanation:

If x% of y is equal to z, What percent z is x ? Correct Answer 1002y x% of y = z ⇒x100y = z ∴x = z×100y

Explanation:

6×3(3-1) Correct Answer 36 6×3(3 - 1) = 6×3×2 = 36

Explanation:

UNESCO was established in- Correct Answer 1945 ইউনেস্কো (UNESCO) জাতিসংঘের একটি বিশেষ সংস্থা। বিশ্বে শিক্ষা, বিজ্ঞান ও সংস্কৃতির প্রসার এবং উন্নয়নের মাধ্যমে মানুষের জীবন মানের উন্নয়ন ঘটানো এই সংস্থার কার্যক্রম। ১৯৪৫ সালের নভেম্বরে লন্ডন সম্মেলনে ইউনেস্কো প্রতিষ্ঠার সিদ্ধান্ত হয়। ১৯৪৬ সালে এই সংস্থা জাতিসংঘের সহায়ক সংস্থা হিসাবে স্বীকৃতি লাভ করে। প্যারিসে এর সদর দপ্তর অবস্থিত

Explanation:

The total number of members of UN Security Council is Correct Answer 5 The Security Council consists of ten elected members, and five permanent members - - China, the United States, France, the United Kingdom, and the Russian Federation. The current and past membership of the Security Council since 1946 can be found in this section.

Explanation:

When was the Bangabandhu I satellite launched successfully into the space Correct Answer May 12, 2018 The Bangabandhu Satellite - 1 (Bangabandhu - 1) is the first Bangladeshi geostationary communications and broadcasting satellite. It is named after the father of the nation, Bangabandhu Sheikh Mujibur Rahman. It was manufactured by Thales Alenia Space and launched on 12 May 2018. The satellite was the first payload launched by a SpaceX Falcon 9 Block 5 rocket.

Explanation:

Which country will host the 2019 Cricket World Cup? Correct Answer England & Wales The 2019 ICC Cricket World Cup was the 12th Cricket World Cup, a quadrennial One Day International (ODI) cricket tournament contested by men's national teams and organised by the International Cricket Council (ICC). It was hosted between 30 May to 14 July across 10 venues in England and a single venue in Wales with the tournament being the fifth time that England had hosted the World Cup while for Wales it was their third.

Explanation:

What is the average life expectancy in Bangladesh? Correct Answer 72 years According to the latest WHO data published in 2018 life expectancy in Bangladesh is: Male 71.1, female 74.4 and total life expectancy is 72.7 which gives Bangladesh a World Life Expectancy ranking of 97. You can see the leading causes of death data and rankings for Bangladesh by clicking on the links below or select the full country health profile at the bottom of the page.

Explanation:

Which sector has highest contribution to the GDP of Bangladesh? Correct Answer Service TCP service use SMTP, SNMP, FTP, HTTP, DNS means Domain Name System which use IP.

Explanation:

When was the Constitution Bangladesh adopted? Correct Answer 4 November 1972 The Constitution of the People's Republic of Bangladesh is the constitutional document of Bangladesh. It was adopted on 4 November 1972 and effective from 16 December 1972. It provides the framework of the Bangladeshi republic with a parliamentary government, fundamental human rights and freedoms, an independent judiciary, democratic local government and a national bureaucracy. The constitution includes references to socialism, secular democracy and the Bengali nationalism. It commits Bangladesh to “contribute to international peace and co - operation in keeping with the progressive aspirations of mankind”. The constitution has several controversial elements like Article 70.

Explanation:

If the square of an odd natural number is divided by 8, then the remainder will be Correct Answer 1 Odd natural number 1,3,5,7,9 ....... 32 = 9 ∴ 9/8 এর reminder 1 52 = 25 ∴ 25/8 এর reminder 1 So, Ans. 1

Explanation:

Which is the smallest district in Bangladesh in items of area? Correct Answer Narayangonj নারায়ণগঞ্জ জেলা বাংলাদেশের মধ্যাঞ্চলের ঢাকা বিভাগের একটি জেলা। নারায়ণগঞ্জ শহরে এ জেলার প্রশাসনিক সদরদপ্তর অবস্থিত। অত্যন্ত প্রাচীন এবং প্রসিদ্ধ সোনারগাঁও এ জেলার অন্তর্গত। নারায়ণগঞ্জ সোনালী আশঁ পাটের জন্য প্রাচ্যের ড্যান্ডি নামে পরিচিত। শীতলক্ষ্যা নদীর পাড়ে অবস্থিত নারায়ণগঞ্জ নদীবন্দর একটি বিখ্যাত নদী বন্দর। ৬৮৩.১৪ বর্গকিলোমিটার আয়তনের এ জেলাটি বাংলাদেশের সবচেয়ে ছোট জেলা। রাজধানী ঢাকার সাথে এ জেলার সীমানা রয়েছে।

Explanation:

If 3 men or 6 boys can do a piece of work in 10 days,working 7 hours a day; how many days will it take to complete a piece of work twice as large with 6 men and 2 boys working together for 8 hours a day ? Correct Answer 7.5 3 men = 6 boys So (6 men + 2 boys) = (12 boys + 2 days) = 14 boys More work, More days (direct proportion) More boys, Less days (indirect ") More hours per day, less days ( " " ) Work 1 : 2 Boys 14 : 6 : : 10 : x Hours per day 8 : 7 ∴(1×14×8×x) = 2×6×7×10 x = 840/112 = 7.5

Explanation:

According to CERB, What is the rank of Bangladesh economy among the largest economic in the world in 2019? Correct Answer 41 যুক্তরাজ্যভিত্তিক গবেষণা প্রতিষ্ঠান সেন্টার ফর ইকোনমিকস এন্ড বিজনেস রিসার্চ (সিইআরবি) এর “ওয়ার্ল্ড ইকোনমিক লিগ টেবিল (ডব্লিউইএলটি) ২০১৯” প্রতিবেদন অনুযায়ী ৪১ তম অর্থনীতির দেশ বাংলাদেশ। শীর্ষ অর্থনীতির দেশ যুক্তরাষ্ট্র এবং ২য় চীন। উল্লেখ্য, ২০৩৩ সালে বাংলাদেশের অবস্থান হবে ২৪ তম।

Explanation:

Which one is known as the mangrove forest Bangladesh ? Correct Answer Sundarbans The Sundarbans is a mangrove area in the delta formed by the confluence of the Ganges, Brahmaputra and Meghna Rivers in the Bay of Bengal. It spans from the Hooghly River in India's state of West Bengal to the Baleswar River in Bangladesh. It comprises closed and open mangrove forests, land used for agricultural purpose, mudflats and barren land, and is intersected by multiple tidal streams and channels. Four protected areas in the Sundarbans are enlisted as UNESCO World Heritage Sites, viz. Sundarbans National Park, Sundarbans West, Sundarbans South and Sundarbans East Wildlife Sanctuaries. Despite these protections, the Indian Sundarbans were considered endangered in a 2020 assessment under the IUCN Red List of Ecosystems framework.

Explanation:

Which one is the natural satellite of earth? Correct Answer Moon সৌরজগতের বর্তমান গ্রহ ৮টি (বুধ, শুক্র, পৃথিবী, মঙ্গল, বৃহস্পতি, শনি, ইউরেনাস ও নেপচুন)। বৃহত্তম গ্রহ বৃহস্পতি ও ক্ষুদ্রতম গ্রহ বুধ। পৃথিবীর একমাত্র উপগ্রহ চাঁদ। আর চাদকে পৃথিবীর প্রাকৃতিক উপগ্রহ বলা হয়।

Explanation:

What is the next number in the following pattern ? 1, 1/2, 1/4, 1/8, - Correct Answer 1/10 Here,….1 ÷ 2 = 1/2½ ÷ 2 = 1/4¼ ÷ 2 = 1/8so, 1/8 ÷ 2 = 1/16 (ans:)….

Explanation:

The length of rectangle is increased by 20% and the width is decreased by 20% . What is the percentage increase or decrease of the area of the rectangle . Correct Answer decreased by 20% 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:

On a trip of 200 miles, a man travels at the rate of 40 miles per hour for the first 100 miles. For the rest of the trip, he travels at the rate of 55 miles per hour . What is his average speed, in miles per hour, for the total trip ? Correct Answer 400/9 Total time spent = 100/40 + 100/55 = 5/2 + 20/11 = 95/22 hours Average speed = 200 / (95/22) = 200 x 22 / 95 =   880/19 miles per hour

Explanation:

In how many ways can a subcommittee of four persons be formed from amongst four women and six men so that one particular man is always included ? Correct Answer 126 Total persons = 4 + 6 = 10 Possible ways =  10 - 1C4 - 1 = 9C3 = 84.

Explanation:

Find the average of all whole numbers between 1 and 100 that end in 3 . Correct Answer 44 The numbers are 3, 13, 23.33.......93 So difference between each number is same. This series in AP. The avarage formula for AP is (first + last term)/2 Therefore the answer is (3 + 93)/2 = 48.

Explanation:

A number is selected at random from 40 to 59 inclusive . What is the probability that the number is prime number ? Correct Answer 3/11 Total number of numbers = 59 - 40 + 1 = 20 Prime numbers : 41, 43, 47, 53, 59 = 5 in total So, the probability = 5/20 =  1/4

Explanation:

FISH : SCALES Correct Answer bird : feathers Fish এর শরীর আবৃত থাকে scales দ্বারা তেমনি bird এর শরীর আবৃত থাকে feathers দ্বারা।

Explanation:

CLOCK : TIME Correct Answer yardstick : distance Clock দ্বারা সময় পরিমাপ করা যায়, yardstick দ্বারা দূরত্ব পরিমাপ করা যায়।

Explanation:

VESSEL : FLEET Correct Answer wolf : pack পার্লামেন্ট অব ব্রিটেন দ্বি - কক্ষ বিশিষ্ট। হাউজ অব লর্ডস, হাউজ অব কমন্স।

Explanation:

ENTREPRENEURS : PROFITS Correct Answer labor : wages ইসলামী উন্নয়ন ব্যাংকের সদর দপ্তর - জেদ্দা, সৌদি আরব। ও আই সির অর্থমন্ত্রী ১৯৭৩ সালে এটি প্রতিষ্ঠা করেন।

Explanation:

UNEMPLOYED : WORKER Correct Answer fallow : field unknown - অজ্ঞাত artist - চিত্রকর fallow - কর্ষিত কিন্তু অনাবাদী {জমি} field - মাঠ; ময়দান; শস্যক্ষেত্র; চরণভূমি; যুদ্ধক্ষেত্র repair - মেরামত করা; পুনরুদ্ধার করা house - বাড়ি ঘর observant - লক্ষ্য কওে এমন, মনোযোগী spectator - দ্রষ্টা । Worker কাজের অভাবে Unemployed হয়; আর field চাষাবাদের অভাবে বা চাষবাদ না করলে fallow হয় ।

Explanation:

SILO : CORN Correct Answer reservoir : water Silo (শস্য গার) হল corn (শস্য) রাখার আধার। reservoir (পাত্র) হল water রাখার আধার।

Explanation:

PATRON : SUPPORT Correct Answer counselor : advice Patron (পৃষ্ঠপোষক) support (সমর্থন) দেয় এবং Counselor ( উপদেষ্টা) advice (উপদেশ) দেয়।

Explanation:

MUTTON : GOAT Correct Answer beef : cow ছাগলের গােস্ত : ছাগল a) ভেড়ার ডাক: ভেড়ার বাচ্চা b) শুকরী : শুকর c) পশুর চামড়া: মহিষ d) গরুর গােস্ত : গরু। Mutton হলাে Goat এর flesh; আর beef হলাে cow এর flesh

Explanation:

A number when divided by 105 leaves 99 as remainder . What will be the remainder if the number is divided by 21 ? Correct Answer 9 We know,  divident = quotient x divisor + remainder So,  divident = quotient x 105 + 99 Now, 105 is completely divisible by 21 yielding the quotient 5. So, we only need to divide the remainder 99 by 21 to see if any remainder remains. Now,  99 = 4 x 21 + 15.  So, 15 will be remained as a remainder if the number is divided by 21 instead of 105.