3451 . There are 120 engineers and technocians working in a project in a project. If the ratio of enginerrs to technicians is 3 to 5, how many technicians are working in the project?

A. 45
B. 60
C. 75
D. 90

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Answer: Option C

Explanation:

ধরি, ইঞ্জিনিয়ার সংখ্যা = 3x
টেকনেশিয়ান সংখ্যা = 5x
3x + 5x = 120
8x = 120
x = 120/8
x = 15
টেকনেশিয়ান সংখ্যা = (15x5) জন = 75 জন।

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3452 . There are 15 boys and 10 girls in a class. If three students are selected at random, what is the probability that 1 girl and 2 boys are selected?

A. 1/40
B. 1/2
C. 21/46
D. 7/41

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Answer: Option C

Explanation:

1 girl & 2 boys can be selected in = (10C1) × (15C2) ways = 10 × 105 ways = 1050 ways.
3 students can be selected from 25 students = 25C3 = 2300 ways
Required probability = 1050/2300 = 21/46. Ans: C

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Officer (Cash) -Sonali Bank | BD Development | BD Krishi Bank - 12.10.2018

A. 8
B. 6
C. 4
D. 16

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Answer: Option A

Explanation:

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3454 . There are 20 members on a football squad. In electing a captain and a co-captain, how many different outcomes of the election is possible ?

A. 760
B. 380
C. 190
D. None of these

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Answer: Option C

Explanation:

20C2 = (20!)/(2!*18!) = (20*19)/2 = 190

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Bangladesh Bank - Officer - 2001

A. 32
B. 72
C. 60
D. 100
E. None of these

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Answer: Option B

Explanation:

Solution:

Let the time taken for one question be x

Then math question takes 2x

Remaining questions other than math questions are 150

then time taken for the remaining questions is 150x

Time taken to solve math questions = 50 × 2x = 100x

100x + 150x = 3 × 60

250x = 180

x = 180/250

Then time taken for math problems = 2 × 180/250 × 50 = 72 minute .

minute

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Bangladesh Bank - Assistant Director - 2009

A. 30
B. 50
C. 40
D. 80

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Answer: Option D

Explanation:

Passed in Bangla = 76% of 200 = 152

Passed in English = 54% of 200 = 108

Failed in both subjects = 10% of 200 = 20

Passed in atleast one subject = 200 - 20 = 180

Passed in both subjects = 152 + 108 - 180 = 80

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3457 . There are 23 poles with a constant distance between each pole. A car takes 24 seconds to reach the 12th pole. How much more time will it take to reach the last pole?

A. 40 seconds
B. 44 seconds
C. 48 seconds
D. 46 seconds

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Answer: Option C

Explanation:

There is error in the question or the options. If the options are right then the last line of the question will be How much more time will it take to reach the last pole?

If the pole 1 is the start point of car then,car is

At 0 zero seconds = in pole 1

At 24th seconds = in pole 12

So it has covered distance of 11 poles in 24 seconds.

So, time taken to cover distance between 2 poles is 2.18 seconds (24/11)

And hence the car would reach 23th pole in 48 seconds (2.18*22).

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সমন্বিত ১০ ব্যাংক ও আর্থিক প্রতিষ্ঠান || অফিসার (জেনারেল) (08-03-2024)

A. 1
B. 3
C. 6
D. 9

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Answer: Option C

Explanation:

Ways : (3×2) = 6

Or, ways: 3! = 6

Ans: 6.

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সমন্বিত ১০ ব্যাংক ও আর্থিক প্রতিষ্ঠান || সিনিয়র অফিসার (10-11-2023)

3459 . There are 3 green, 4 orange and 5 white colour bulbs in a bag. If a bulb is picked at random, what is the probability of having either a green green or a white bulb?

A. $\frac{3}{4}$
B. $\frac{2}{5}$
C. $\frac{1}{3}$
D. $\frac{2}{3}$

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Answer: Option D

Explanation:

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জনতা ব্যাংক || অফিসার (আরসি) (28-06-2024) || 2024

3460 . There are 4 cows and 4 goats are in a field. If two of the animals are selected at random, what is the probability that both will be cows?

A. $\frac{1}{2}$
B. $\frac{3}{7}$
C. $\frac{3}{4}$
D. $\frac{3}{14}$

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Answer: Option D

Explanation:

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Standard Bank Plc || Trainee Assistant Officer (15-03-2025) || 2025

A. 1/2
B. 3/7
C. 3/4
D. 3/14
E. None of these

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Answer: Option D

Explanation:

মোট লোক সংখ্যা = (৪ + ৪) জন = ৮ জন

৪ জন হতে ১ জন মহিলা হওয়ার সম্ভাবনা = ৪/৮ = ১/২

বাকি ৩ জন মহিলা ও ৪ জন পুরুষ হতে ১ জন মহিলা হবার সম্ভাবনা = ৩/৭

দুইজন মহিলা হবার সম্ভাবনা = ১/২ × ৩/৭ = ৩/১৪

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3462 . There are 40 members in a club; 9/20 of the members are engineers; and 4/5 of the members are male. What can be the possible minimum number of male engineers?

A. 10
B. 12
C. 16
D. 20

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Answer: Option A

Explanation:

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3463 . there are 5 red and 3 black in a bag probability of drawing a black ball is

A. 5/8
B. 1/2
C. 3/8
D. 1/4

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Answer: Option C

Explanation:

মোট বলের সংখ্যা = 5 + 3 = 8 টি

কালো বলের সংখ্যা = 3 টি

একটি কালো বল উঠার সম্ভাব্যতা = 3/8

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Sonali Bank Ltd. Senior Officer Recruitment 01.06.2018

A. 1/2
B. 3/7
C. 1/4
D. 3/14

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Answer: Option D

Explanation:

The probability that two women are selected is as follows:

4/8 x 3/7 = 1/2 x 3/7 = 3/14.

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3465 . There are 8 more men than women on board of directors of a company. If there are 20 members on the board, how many are men ?

A. 6
B. 8
C. 12
D. 14

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Answer: Option D

Explanation:

Let, women = x

Men = x + 8

x + x + 8 = 20

2x = 12

x = 6

Women = x = 6

Men = 6 + 8 = 14 , Men = 20 - 6 = 14.

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Bangladesh Bank - Assistant Director - 2010

3451 . There are 120 engineers and technocians working in a project in a project. If the ratio of enginerrs to technicians is 3 to 5, how many technicians are working in the project?

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3452 . There are 15 boys and 10 girls in a class. If three students are selected at random, what is the probability that 1 girl and 2 boys are selected?

3453 . There are 18 bananas on a tree. If one munkey eats 1/3 of the bananas and another monkey eats 1/3 of the rest, how many bananas are still on the tree?

3454 . There are 20 members on a football squad. In electing a captain and a co-captain, how many different outcomes of the election is possible ?

3455 . There are 200 questions on a 3-hour examination . Among these questions 50 are mathematics problems. It is suggested that twice as much time be spent on each math problem as for each other question. How many minutes should be spent on mathematics problem

3456 . There are 200 students in a class. 76% passed in Bangla and 54% passed in English. If 10% of the students failed in both the subjects then how many of them passed in both subjects?

3457 . There are 23 poles with a constant distance between each pole. A car takes 24 seconds to reach the 12th pole. How much more time will it take to reach the last pole?

3458 . There are 3 doors to a lecture room. In how many ways can a lecturer enter the room from one door and leave from another door ?

3461 . There are 4 women and 4 men sitting in a waiting room for job interview. If two of the applicants are selected at random, what is the probalility that both will be women?

3462 . There are 40 members in a club; 9/20 of the members are engineers; and 4/5 of the members are male. What can be the possible minimum number of male engineers?

3463 . there are 5 red and 3 black in a bag probability of drawing a black ball is

3464 . There are 8 job applicants sitting in waiting room; 4 women and 4 men. If two of the applicants are selected at random, what is the probability that both will be women?

3465 . There are 8 more men than women on board of directors of a company. If there are 20 members on the board, how many are men ?

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