Ratio of present ages of A and B is 4:7. After 12 years, the ratio becomes 6:9. Present age of A is? MCQ with Answer and Explanation

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Ratio of present ages of A and B is 4:7. After 12 years, the ratio becomes 6:9. Present age of A is?

A. 49 years

B. 44 years

C. 40 years

D. 88 years

Answer: Option B

Solution (By JKSSB Mock Tests)

Let ages 4k and 7k. Then (4k + 12)/(7k + 12) = 6/9. Solving gives k ≈ 11, age of A = 4*11 = 44.

This question belongs to: Maths Ratio and Proportion

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Question #1

If a:b = 7:10 and b:c = 10:9, then a:b:c = ?

A. 7:11:9

B. 14:20:18

C. 7:10:9

D. 6:10:10

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 7:10, b:c = 10:9 ⇒ a:b:c = 7:10:9.

This question belongs to: Maths Ratio and Proportion

Question #2

If a:b = 3:8 and b:c = 8:4, then a:b:c = ?

A. 3:8:4

B. 2:8:5

C. 3:9:4

D. 6:16:8

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 3:8, b:c = 8:4 ⇒ a:b:c = 3:8:4.

This question belongs to: Maths Ratio and Proportion

Question #3

Find the mean proportional between 10 and 48.

A. 21

B. 24

C. 42

D. 58

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Correct Answer: Option A

Explanation:
Mean proportional = √(10 × 48) = √(480) = 21.

This question belongs to: Maths Ratio and Proportion

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