616 . 20 workers can finish a task in 30 days. How many additional workers are needed to finish the same task in 25 days?

A. 6
B. 8
C. 10
D. 12
E. None of these

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Answer: Option E

Explanation:

By 30 days a work is done by 20 workers

so by 25 days '' '' '' '' '' (20*30/25) = 24

So additional workers needed = 24 - 20 = 4

ans: 4 workers

617 . 28 is divided into two parts such that 6 times the first part added to 4 times the second part makes 152. The first part is

A. 16
B. 18
C. 20
D. 22

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Answer: Option C

Explanation:

Let's call the first part "x" and the second part "y."

We are given two pieces of information:

The sum of the two parts is 28: x + y = 28
6 times the first part added to 4 times the second part equals 152: 6x + 4y = 152

We can use these two equations to solve for the value of "x."

First, let's solve the first equation for "y":

x + y = 28 y = 28 - x

Now, substitute this expression for "y" into the second equation:

6x + 4(28 - x) = 152

Now, solve for "x":

6x + 112 - 4x = 152

Combine like terms:

2x + 112 = 152

Subtract 112 from both sides:

2x = 152 - 112 2x = 40

Now, divide by 2:

x = 40 / 2 x = 20

So, the first part is 20.

সমন্বিত ৭ ব্যাংক || সিনিয়র অফিসার-05-11-2021 ||

A. 2
B. 100
C. 37
D. 4.6

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Answer: Option A

Explanation:

619 . 2m+1 - 2m = ?

A. 2
B. 4
C. 2m
D. 2m+1

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Answer: Option C

Explanation:

620 . 3, 9, 5, 11, 7, ...

A. 9
B. 10
C. 13
D. 15

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Answer: Option C

Explanation:

621 . 3 & 5 are factors of F. We can conclude that--

A. 3 x 5 = F
B. 8 is a factor of F
C. F is multiple of 15
D. 3 & 5 are the only factors of F

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Answer: Option C

Explanation:

622 . 3 , 12, 30,. 39 are the first five terms of a sequence . Each term after the first is obtained by adding 9 to the term immediately preceding it .which term in the sequence is equal to 3 + (33 -1) 9?

A. 8 th
B. 9th
C. 32nd
D. 33rd
E. None of these

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Answer: Option D

Explanation:

First, term, = 3

General difference = 12 - 3 = 9

Here, 3 + ( 33 - 1) 9 = 3 + 32 × 9 = 291

nth term = a + ( n - 1) d

291 = 3 + ( n - 1) 9

n - 1 = 32

n = 33

623 . 3.003/2.002 =?

A. 1.05
B. 1.5
C. 1.501
D. 1.5015
E. none of them

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Answer: Option B

Explanation:

3.003/2.002

= 3003/2002

= 1.5

624 . 3 liters of water is added to 15 liters of mixture of a 20% solution of alcohol in water. The strength of alcohol is now--

A. 24%
B. 16%
C. 25/2%
D. 50/3%

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Answer: Option D

Explanation:

625 . 3 men or 5 women or 8 boys can finish a work in 38 days. How many days will be required to complete the same work by 6 men , 10 women and 6 boys together ?

A. 5
B. 6
C. 7
D. None of these

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Answer: Option D

Explanation:

Work done by 3 men = 5 women = 8 boys
1 man = 8/3 boys
6 men = 16 boys
1 woman = 8/5 boys
10 women = 16 boys
Now, 6 men + 10 women + 6 boys = 16 + 16 + 6 = 38 boys
8 boys need 38 days
1 boy needs (38x8) days
So, 38 boys need (38x8)/38 = 8days

626 . 3 pumps, working 8 hours a day, can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the tank in 1 day?

A. 9
B. 10
C. 11
D. 12

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Answer: Option D

Explanation:

3 pumps working in 2days =8×2= 16 hr

Means they can empty a tank in 16 hr .

3pumps 1 hr work = 1/16

1pumps 1 hr work =1/3×16

4pumps 1hr work =4×1/3×16= 1/12

Hence they will empty the tank in 1/ 12 hr

সমন্বিত পাঁচ ব্যাংক || অফিসার ক্যাশ - 06.11.2021

A. 10
B. 11
C. 12
D. 9

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Answer: Option C

Explanation:

3 pumps 2 days empties by working 8 hrs

1 " 2 " " " " ( 8 × 3) hrs

1 " 1 " " " " ( 8 × 3 × 2) hrs

4 " 1 " " " " ( 8 × 3 × 2) /4 hrs

= 12 hrs

Bangladesh Bank - Officer(Cash) - 2016

A. 9
B. 10
C. 11
D. 12

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Answer: Option D

Explanation:

আশুগঞ্জ পাওয়ার স্টেশন কোম্পানী লিঃ (APSCL) || সহকারী প্রকৌশলী (মেকানিক্যাল ও ইলেকট্রিক্যাল এন্ড ইলেকট্রনিক্স) (27-09-2024) || 2024

A. 9 hours
B. 10 hours
C. 11 hours
D. 12 hours
E. None of these

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Answer: Option D

Explanation:

630 . 3 years ago, the average age of a family of 5 members was 17 years. With the birth of a new baby, the average remains the same even today. Find the age of the baby.

A. 1 year
B. 2 year
C. 2.5 year
D. 3 year

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Answer: Option B

Explanation:

3 years ago average age of 5 members is 17 years

Sum of ages of 5 members, 3 years ago ⇒ 17 × 5 = 85

Average of Present age of 5 members = 20 years

Sum of present ages of 5 members = 20 × 5 = 100

But a baby born and average remains same i.e 17 years

Sum of present ages of 6 members = 17 × 6 = 102

Age of baby = 102 - 100 = 2 years

NRBC BANK PO/TAO (16-06-2023) || 2023

616 . 20 workers can finish a task in 30 days. How many additional workers are needed to finish the same task in 25 days?

617 . 28 is divided into two parts such that 6 times the first part added to 4 times the second part makes 152. The first part is

618 . 2log105 + log10 36 - log10 9 = ?

619 . 2m+1 - 2m = ?

620 . 3, 9, 5, 11, 7, ...

621 . 3 & 5 are factors of F. We can conclude that--

622 . 3 , 12, 30,. 39 are the first five terms of a sequence . Each term after the first is obtained by adding 9 to the term immediately preceding it .which term in the sequence is equal to 3 + (33 -1) 9?

623 . 3.003/2.002 =?

624 . 3 liters of water is added to 15 liters of mixture of a 20% solution of alcohol in water. The strength of alcohol is now--

625 . 3 men or 5 women or 8 boys can finish a work in 38 days. How many days will be required to complete the same work by 6 men , 10 women and 6 boys together ?

626 . 3 pumps, working 8 hours a day, can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the tank in 1 day?

627 . 3 pumps , working 8 hours a day, can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the tank in 1 day ?

628 . 3 pumps working 8 hours a day can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the tank in 1 day?

629 . 3 pumsps, working 8 hours a day, can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the same tank in 1 day?

630 . 3 years ago, the average age of a family of 5 members was 17 years. With the birth of a new baby, the average remains the same even today. Find the age of the baby.

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