571 . 12 students working for 5 hours a day can solve a certain number of problems in 8 days. How many students are needed to solve. Five times the original number of problems, if they work at 4 hours a day for 15 days?

A. 90
B. 45
C. 95
D. 40

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Answer: Option D

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572 . 12 year old Manick is three times as old as his brother Rahul. How old will Manick be when he is twice as old as Rahul?

A. 14 years
B. 16 years
C. 18 years
D. 20 years
E. None of these

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Answer: Option B

Explanation:

Manick এর বর্তমান বয়স  =  12; Rahul  =  123123  = 4
ধরি, Manick x বছরে পরে হবে Rahul এর twice old.
তাহলে 12  +  x  =  2(4  +  x)
 x  =  4
তাহলে Manick এর required age  =  12  +  4  =  16 years.

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573 . 120 students in a class play cricket or football or both. If 75 students play cricket and 60 students play football, how many play both?

A. 15
B. 16
C. 76
D. 38

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Answer: Option A

Explanation:

শুধু ক্রিকেট খেলে = 75 জন

এবং ফুটবল খেলে = 60 জন

ক্রিকেট ও ফুটবল খেলে = 75 + 60 = 135 জন

মোট ছাত্র 120 জন হলে তাদের মধ্যে উভয়টি খেলে = 135 - 120 = 15 জন ।

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574 . 125 gallons of a mixture contains 20% water . What amount of additional water should be added such that the water content is raised to 25%?

A. 15/2 gallons
B. 17/2 gallons
C. 19/2 gallons
D. 19/2 gallons
E. 8 13 gallons

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Answer: Option D

Explanation:

20% of 125 gal = 0.20 × 125 gallon = 25 gal water

Lets add w gal water such that the water content is raised to 25%

so, 25 + w = 0.25 (o 125 + w)

25 + w = 31.25 + . 25w

w - 0.25w = 31.25 - 25

0.75 w = 6.25

w = 8.33 বা 8 1/3

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575 . 15% monthly salary increase resulted in a Tk.14400 per year increase in salary for an employee. What was his monthly salary before the increase?

A. Tk.8000
B. Tk.9000
C. Tk.5000
D. Tk.12000

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Answer: Option A

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576 . 15 men take 21 days of 8 hours each to do a piece of work. How many days of 6 hours each would 21 women take , if 3 women do as much work as 2 men ?

A. 18
B. 20
C. 25
D. 30

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Answer: Option D

Explanation:

3 women can do as much work as 2 men

∴ efficiency of women to do a piece of work, e2 = (1/3)

∴ efficiency of men to do a piece of work, e1 = (1/2)

We know,

Total work done = (no. of men or women) * (no. of days) * (no. of hours) * (efficiency)

Therefore,

m1 * d1 * h1 * e1 = m2 * d2 * h2 * e2

or, 15 * 21 * 8 * (1/2) = 21 * d2 * 6 * (1/3)

or, d2 = 30 days .

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Bangladesh Bank - Assistant Director - 2016

A. 11
B. 13
C. 15
D. 17

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Answer: Option B

Explanation:

169 - এর বর্গমূল 169 = 13.

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৩৪ তম বিসিএস প্রিলিমিনারি টেস্ট (24-05-2013)

A. Sunday
B. Saturday
C. Friday
D. None of these

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Answer: Option B

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One Bank Ltd || Special Cadre Officer (03-01-2025) || 2025

A. 6
B. 7
C. 8
D. 9

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Answer: Option B

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Bangladesh Bank - Assistant Director - 2014

580 . 1f 9 is $\frac{3}{4}$ of n, what number is $\frac{5}{6}$ of n?

A. 12
B. 15
C. 10
D. 12.5

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Answer: Option C

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

A. 0.0004
B. 0.4
C. 0.02
D. 0.04

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Answer: Option D

Explanation:

2 এর 2% = 2 এর 2/100 = 4/100 = 0.04

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582 . 2, 5, 9, 19, 37, ?

A. 75
B. 76
C. 78
D. 73

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Answer: Option A

Explanation:

2 5 9 19 37 ?,

Here,

2*2 + 1 = 5,

5*2 - 1 = 9,

9*2 + 1 = 19,

19*2 - 1 = 37,

37*2 + 1 = 75.

So the answer would be 75

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Bangladesh Bank - Officer(Cash) - 2016

A. 25
B. 40
C. 54
D. 90

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Answer: Option C

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584 . 2 bats and 2 balls cost Tk.300. 5 bats and 5 balls cost Tk.750. 3 bats and 3 balls cost--

A. Tk.400
B. Tk.450
C. Tk.500
D. Tk.550

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Answer: Option B

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585 . 2 cars leave a office at 12 noon, with one car traveling south at 60 mph and the other north at 40 mph along a straight road. At what time will they be 50 miles apart?

A. 2:30
B. 12:30
C. 3:30
D. 1:30

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Answer: Option B

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571 . 12 students working for 5 hours a day can solve a certain number of problems in 8 days. How many students are needed to solve. Five times the original number of problems, if they work at 4 hours a day for 15 days?

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572 . 12 year old Manick is three times as old as his brother Rahul. How old will Manick be when he is twice as old as Rahul?

573 . 120 students in a class play cricket or football or both. If 75 students play cricket and 60 students play football, how many play both?

574 . 125 gallons of a mixture contains 20% water . What amount of additional water should be added such that the water content is raised to 25%?

575 . 15% monthly salary increase resulted in a Tk.14400 per year increase in salary for an employee. What was his monthly salary before the increase?

576 . 15 men take 21 days of 8 hours each to do a piece of work. How many days of 6 hours each would 21 women take , if 3 women do as much work as 2 men ?

577 . 169 is equal to

578 . 17th June was Sunday. What day of the week was on 10th November of the same year?

579 . 18 pumps can raise 2170 tonnes of water in 10 days, working 7 hours a day; in how many days will 16 pumps raise 1736 tonnes of water, working 9 hours a day?

581 . 2% of 2=?

582 . 2, 5, 9, 19, 37, ?

583 . 2, 9, 6, 7, 18, 5, ....

584 . 2 bats and 2 balls cost Tk.300. 5 bats and 5 balls cost Tk.750. 3 bats and 3 balls cost--

585 . 2 cars leave a office at 12 noon, with one car traveling south at 60 mph and the other north at 40 mph along a straight road. At what time will they be 50 miles apart?

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