901 . A hawker buy every 4 oranges at Tk. 25 and then sells every 8 oranges at Tk. 56. What is the percentage of the profit?

A. 12%
B. 9%
C. 7.5%
D. 5.25%

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Answer: Option A

Explanation:

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বাংলাদেশ অর্থনৈতিক অঞ্চল কর্তৃপক্ষ (BEZA) | সহকারী ব্যবস্থাপক | ৩০.১১.২০১৮

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902 . A hawker takes 1.25 hours to deliver newspapers on his route. Another hawker takes 15 minutes longer to deliver these papers on the same route. How long would it take to deliver the papers if both of them worked together?

A. 22.25 min
B. 37.5 min
C. 40 min
D. 65 min
E. None of these

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Answer: Option C

Explanation:

First hawker takes 1.25 hours or 75 minutes and second hawker takes 75 + 15 = 90 minutes.

Together they can finish (1/75 + 1/90) = 11/450 part of the delivery in 1 minute.

So, together they will finish the whole delivery in 1/(11/450) = 450/11 = 40.91 minutes.

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903 . A house-owner was having his house painted. He was advised that he would require 25 kg of paint. Allowing for 15% wastage and assuming that the paint is available in 2 kg cans. What would be the cost of paint purchased, if one can cost Tk.16?

A. 160
B. 360
C. 240
D. 180

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Answer: Option C

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904 . A is 3 years older than B and 3 years younger than C. B and D are twins. How older is C than D?

A. 2 years
B. 3 years
C. 6 years
D. 12 years
E. None of these

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Answer: Option C

Explanation:

যেহেতু A,B অপেক্ষা 3 বছরের বড় এবং C অপেক্ষা 3 বছরের ছোট আবার B এবং D হচ্ছে যমজ। তাই C এর বয়স D অপেক্ষা 3 + 3 = 6 বছর বেশি।

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905 . A is 3 years older than B and 3 years younger than C.B and D are twins How older is C than D

A. 12 years
B. 6 years
C. 3 years
D. Cannot be Determined

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Answer: Option B

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সমন্বিত ব্যাংক অফিসার (ক্যাশ) || (02-06-2023)

A. 11 days
B. 13 days
C. 20x3/17 𝑑𝑎𝑦𝑠
D. None of these

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Answer: Option B

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Bangladesh Bank - Assistant Director - 2016

A. 13 days
B. 15 days
C. 10 days
D. None of these

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Answer: Option A

Explanation:

Ratio of times taken by A and B = 100:130 = 10:13
Suppose B takes x days to do the work.
Then, 10:13 :: 23:x
∴ x = 299/10
A's 1 day's work = 1/23
B's 1 day's work = 10/299

(A+B)'s 1 day's work = (1/23 + 10/299) = 1/13
Therefore, A and B together can complete the work in 13 days.

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Officer (General) |-Sonali | Janata | Bangladesh Krishi_Bangladesh Development bank ২৪.০৫.২০১৯

A. 3 km/hr
B. 5 km/hr
C. 4 km/hr
D. 7 km/hr

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Answer: Option C

Explanation:

ধরি, A এর speed x km/hr ; B এর speed =(7-x) km/hr

প্রশ্নমতে, 24/x + 24/7-x= 14

Or, 168-24x + 24x/x(x-7)=14

Or, 168/x(x-7)=14

Or, 98x-14x^2=168

Or, 7x- x^2=12

Or, x^2- 7x + 12= 0

Or, x^2- 4x- 3x -12= 0

Or, x(x-4)-3 (x-4)=0

or, (x-4) (x-3)=0

X-4= 0 অথবা x-3=0

X=4, x=3

অতএব, A is faster than B,

So, A's speed 4 km/hr

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909 . a is greater than b by 2 and b is greater than c by 10 . If a+ b+ c =130 , then (b+c) -a =?

A. 42
B. 38
C. 34
D. 44

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Answer: Option C

Explanation:

Let, c = x

∴b = x + 10 and

a = x + 12

Now,a + b + c = 130

= > x + 12 + x + 10 + x = 130

= > 3x = 130 - 22 = 108

∴x = (108/3) = 36 i.e, c = 36

∴ b = 46 and a = 48

∴(b + c) - a = (46 + 36) - 48 = 34 Ans.

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910 . A is the widow of B. B & C were the only children of E. C is unmarried and is a doctor. D is the grand-daughter of E and studies science . How is A related to D ?

A. aunt
B. daughter
C. sister
D. sister-in-law
E. None of these

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Answer: Option B

Explanation:

E এর দুইজন সন্তান হচ্ছে যথাক্রমে B ও C. C অবিবাহিত তাই তার কোন সন্তান নেই। B এর বিধবা স্ত্রী A. D, E এর নাতনি। তাই এ সন্তান (কন্যা) অবশ্যই A এর।

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Bangladesh Bank - Assistant Director - 2009

A. 28 days
B. 24 days
C. 25 days
D. 21 days

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Answer: Option D

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

A. 7
B. 8
C. 9
D. 10

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Answer: Option D

Explanation:

ধরি, C এর বয়স x বছর

B এর বয়স। 2x বছর

A এর বয়স = ( 2x + 2) বছর

x + 2x + 2x + 2 = 27

5x = 27 - 2

x = 25/5

x = 5

B এর বয়স ( 2 ×5) বছর = 10 বছর

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913 . A is two years older than B who is twice as old as C. If the total of the ages of A, B and C be 27, then how old is B?

A. 7
B. 8
C. 9
D. 10

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Answer: Option D

Explanation:

ধরি, C এর বয়স x বছর

B এর বয়স। 2x বছর

A এর বয়স = ( 2x + 2) বছর

x + 2x + 2x + 2 = 27

5x = 27 - 2

x = 25/5

x = 5

B এর বয়স ( 2 ×5) বছর = 10 বছর

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914 . A jar contains 10 red marbles and 30 green marbles . How many red marbles must be added to the jar so that 60% of the marbles will be red ?

A. 25
B. 35
C. 40
D. 60

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Answer: Option B

Explanation:

New percentage of green marbles = 100% - 60% = 40%

Now, 40% of total marbles = 30 [number of green marbles remains unchanged]

So, total number or 100% of marbles = 30 x 100 / 40 = 75

More red marbles required = 75 - (10 + 30) = 35

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915 . A jar contains 4 red toothpicks , 10 blue toothpicks and 6 yellow toothpicks. If three toothpicks are removed from the bag at random and no toothpick is returned to the bag after removal, what is the probability that all three toothpicks will be blue?

A. 1/2
B. 1/8
C. 3/20
D. 2/19
E. None of these

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Answer: Option D

Explanation:

Probability = (10/20) × (9/19)×( 8/18) = 2/19

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901 . A hawker buy every 4 oranges at Tk. 25 and then sells every 8 oranges at Tk. 56. What is the percentage of the profit?

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902 . A hawker takes 1.25 hours to deliver newspapers on his route. Another hawker takes 15 minutes longer to deliver these papers on the same route. How long would it take to deliver the papers if both of them worked together?

903 . A house-owner was having his house painted. He was advised that he would require 25 kg of paint. Allowing for 15% wastage and assuming that the paint is available in 2 kg cans. What would be the cost of paint purchased, if one can cost Tk.16?

904 . A is 3 years older than B and 3 years younger than C. B and D are twins. How older is C than D?

905 . A is 3 years older than B and 3 years younger than C.B and D are twins How older is C than D

906 . A is 30% more efficient than B. How much time will they, working together, take to complete a job which A alone could have done in 23 days?

907 . A is 30% more efficient than E How much time will they , working together , take to complete a job which A alone could have done in 23 days?

908 . A is faster than B,A and B each walk 24km. The sum of their speeds is 7 km/hr and the sum of times taken by them is 14 hours. Then, A's speed is equal to :

909 . a is greater than b by 2 and b is greater than c by 10 . If a+ b+ c =130 , then (b+c) -a =?

910 . A is the widow of B. B & C were the only children of E. C is unmarried and is a doctor. D is the grand-daughter of E and studies science . How is A related to D ?

911 . A is twice as good a workman as B and together they finish a piece of work in 1 day. A alone can finish the work in -

912 . A is two years older than B who is twice as old as C. If the total age of A,B and C is 27, then how old is B ?

913 . A is two years older than B who is twice as old as C. If the total of the ages of A, B and C be 27, then how old is B?

914 . A jar contains 10 red marbles and 30 green marbles . How many red marbles must be added to the jar so that 60% of the marbles will be red ?

915 . A jar contains 4 red toothpicks , 10 blue toothpicks and 6 yellow toothpicks. If three toothpicks are removed from the bag at random and no toothpick is returned to the bag after removal, what is the probability that all three toothpicks will be blue?

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