3286 . The radius of circle A is r, and the radius of circle B is 3/4r. What is the ratio of the area of circle A to the area of circle B?

A. 16 to 9
B. 9 to 16
C. 1 to 4
D. 4 to 3

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Answer: Option A

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Dhaka Bank Ltd | Probationary Officer | 05-02-2021

3287 . The range of $f (x) = \frac{1}{x + 1}$ is:

A. $R \ \{0\}$
B. $X > - 1$
C. $X < - 1$
D. $R \ \{- 1\}$

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Answer: Option A

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সমন্বিত ৮ ব্যাংক ও ১ আর্থিক প্রতিষ্ঠান — অফিসার (জেনারেল) (04-07-2025) | 2025

A. 125%
B. 40%
C. 80%
D. 12.5%

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Answer: Option A

Explanation:

(5/4)×100

= 125%

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3289 . The ratio between the length and breadth of a field is 7 : 5. The perimeter of the field is 360 meter. What is the area of the field?

A. 31000 sq. meter
B. 31500 sq. meter
C. 7875 sq. meter
D. 8775 sq. meter

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Answer: Option C

Explanation:

Let the length and breadth be 7x and 5x meters respectively.

Then, perimeter, 2(7x + 5x) = 360

or, 2×12x = 360

or, 24x = 360

or, x = 360/24 = 15

Area = length×breadth = 7x × 5x = 35x2 = 35×152 = 35×225 = 7875 m2

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3290 . The ratio between the length and the perimeter of a rectangular plot is 1:3. What is the ratio between the length and breadth of the plot?

A. 1:2
B. 3:2
C. 2:1
D. None of these

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Answer: Option A

Explanation:

Hints: Let the length is x and breadth is y. Then perimeter = 2 ( x + y)

Now, x / 2(x + y) = 1/3

3x = 2x + 2y

x = 2y

x/y = 1/2 = 1 : 2

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3291 . The ratio between the perimeter and the breadth of a rectangle is 5:1. If the area of the rectangle is 216 sq. cm, what is the length of the rectangle?

A. 16 cm
B. 18 cm
C. 20cm
D. 24 cm
E. None of these

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Answer: Option B

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Three Combined Bank Recruitment - Senior Officer 03 .08.2018 ||

A. 3 : 4
B. 3 : 5
C. 4 : 3
D. None of these

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Answer: Option D

Explanation:

Hints: Let P age and Q age be 6x years and 7x years

Then, 7x - 6x = 4

x = 4

So the required ratio will be (6x + 4)/(7x + 4) = 28/32 = 7/8

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3293 . The ratio between two numbers is 3:4 and their least common multiple is 180. What is the first number?

A. 15
B. 20
C. 45
D. 60
E. None of these

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Answer: Option C

Explanation:

এ ধরনের math করতে হলে নিচের পদ্ধতিটি মনে রাখুন
3  ×  4  ×  x  =  180
so x  =  15
এবং সেই সংখ্যাটি  =  3  ×  15  =  45

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3294 . The ratio of $\frac{1}{5}$ to $\frac{2}{7}$ -is

A. $3 : 5$
B. $5 : 7$
C. $7 : 9$
D. $7 : 10$

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Answer: Option D

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Bangladesh Bank - Assistant Director - 2008

A. 7
B. 10
C. 12
D. 14

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Answer: Option B

Explanation:

Father = 5x

Son = x

So, ( 5x + 5) : ( x + 5) = 3 : 1

5x + 5)/ x + 5 = 3/1

5x + 5 = 3x + 15

2x = 10

x = 5

After 5 years son age = 5 + 5 = 10

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3296 . The ratio of ages of a father and his son was 5:1. What is the age of the son after five years, if the ratio of their ages is 3:1 by this time ?

A. 7
B. 10
C. 12
D. 14
E. 16

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Answer: Option B

Explanation:

Father = 5x

Son = x

So, ( 5x + 5) : ( x + 5) = 3 : 1

5x + 5)/ x + 5 = 3/1

5x + 5 = 3x + 15

2x = 10

x = 5

After 5 years son age = 5 + 5 = 10

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Agrani Bank Ltd. Recruitment Test for Senior Officer 12.02.2010

A. 6
B. 8
C. 10
D. 12

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Answer: Option B

Explanation:

No. of boys = 24× 1/ (1 + 2) = 24 ×1/3 = 8

No. of Girls = 24 × 2/3 = 16

How many boys = 16 - 8 = 8

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3298 . The ratio of boys and girls in a class is 1:2 and the class as 24 students . How many boys would have to be admitted to the class in order to make the ratio of boys to girls 1 : 1?

A. 6
B. 8
C. 10
D. 12

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Answer: Option B

Explanation:

Boys = 24 × 1 / 1 + 2 = 8

Girls = 16

Now, ( 8 + x) ; 16 = 1 : 1

gives x = 8

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3299 . The ratio of boys and girls in a class is 4 : 5. If 10% of the boys and 20% of the girls failed in an examination, what percentage of students passed in the exam?

A. 80%
B. 82%
C. 85%
D. None

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Answer: Option D

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3300 . The ratio of boys and girls in a class is 4:5. If 10% of the boys and 20%of the girls failed in an examination, what percentage of students passed in the exam?

A. 85%

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Answer: Option A

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বিমান বাংলাদেশ এয়ারলাইন্স লিঃ নিয়োগ পরীক্ষা-২০১৮। গ্রাউন্ড সার্ভিস অ্যাসিসটেন্ট। ১৩.১০.২০১৮

3286 . The radius of circle A is r, and the radius of circle B is 3/4r. What is the ratio of the area of circle A to the area of circle B?

3288 . The ratio 5 :4 expressed as a percent equals

3289 . The ratio between the length and breadth of a field is 7 : 5. The perimeter of the field is 360 meter. What is the area of the field?

3290 . The ratio between the length and the perimeter of a rectangular plot is 1:3. What is the ratio between the length and breadth of the plot?

3291 . The ratio between the perimeter and the breadth of a rectangle is 5:1. If the area of the rectangle is 216 sq. cm, what is the length of the rectangle?

3292 . The ratio between the present ages of P and Q is 6 : 7. If Q is 4 years older than P, what will be the ratio of the ages of P and Q after 4 years?

3293 . The ratio between two numbers is 3:4 and their least common multiple is 180. What is the first number?

3295 . The ratio of ages of a father and his son was 5 : 1. What is the age of the son after five years, if the ratio of their ages is 3 : 1 by this time?

3296 . The ratio of ages of a father and his son was 5:1. What is the age of the son after five years, if the ratio of their ages is 3:1 by this time ?

3297 . The ratio of boys and girls in a class is 1 : 2 and the classroom has 24 students. How many boys would have to be admited to make ratio of boys to girls 1 : 1?

3298 . The ratio of boys and girls in a class is 1:2 and the class as 24 students . How many boys would have to be admitted to the class in order to make the ratio of boys to girls 1 : 1?

3299 . The ratio of boys and girls in a class is 4 : 5. If 10% of the boys and 20% of the girls failed in an examination, what percentage of students passed in the exam?

3300 . The ratio of boys and girls in a class is 4:5. If 10% of the boys and 20%of the girls failed in an examination, what percentage of students passed in the exam?

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