Ratio of present ages of A and B is 4:8. After 8 years, the ratio becomes 6:10. Present age of A is? MCQ with Answer and Explanation

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Ratio of present ages of A and B is 4:8. After 8 years, the ratio becomes 6:10. Present age of A is?

A. 37 years

B. 88 years

C. 49 years

D. 44 years

Answer: Option D

Solution (By JKExamLibrary)

Let ages 4k and 8k. Then (4k + 8)/(8k + 8) = 6/10. Solving gives k ≈ 11, age of A = 4*11 = 44.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

If a:b = 4:5 and b:c = 5:5, then a:b:c = ?

A. 4:5:5

B. 4:6:5

C. 3:5:6

D. 8:10:10

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 4:5, b:c = 5:5 ⇒ a:b:c = 4:5:5.

This question belongs to: Maths Ratio and Proportion

Question #2

If a:b = 2:9 and b:c = 9:7, then a:b:c = ?

A. 2:10:7

B. 2:9:7

C. 1:9:8

D. 4:18:14

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 2:9, b:c = 9:7 ⇒ a:b:c = 2:9:7.

This question belongs to: Maths Ratio and Proportion

Question #3

Ratio of present ages of A and B is 3:7. After 5 years, the ratio becomes 5:10. Present age of A is?

A. 65 years

B. 144 years

C. 77 years

D. 72 years

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Correct Answer: Option D

Explanation:
Let ages 3k and 7k. Then (3k + 5)/(7k + 5) = 5/10. Solving gives k ≈ 24, age of A = 3*24 = 72.

This question belongs to: Maths Ratio and Proportion

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