Ratio of present ages of A and B is 4:5. After 5 years, the ratio becomes 5:8. Present age of A is? MCQ with Answer and Explanation

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Ratio of present ages of A and B is 4:5. After 5 years, the ratio becomes 5:8. Present age of A is?

A. 68 years

B. 152 years

C. 76 years

D. 81 years

Answer: Option C

Solution (By JKExamLibrary)

Let ages 4k and 5k. Then (4k + 5)/(5k + 5) = 5/8. Solving gives k ≈ 19, age of A = 4*19 = 76.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

Find the mean proportional between 4 and 32.

A. 14

B. 11

C. 22

D. 36

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Correct Answer: Option B

Explanation:
Mean proportional = √(4 × 32) = √(128) = 11.

This question belongs to: Maths Ratio and Proportion

Question #2

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

A. 16:8:8

B. 8:4:4

C. 7:4:5

D. 8:5:4

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Correct Answer: Option B

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

This question belongs to: Maths Ratio and Proportion

Question #3

If a:b = 6:9 and b:c = 9:11, then a:b:c = ?

A. 6:9:11

B. 5:9:12

C. 6:10:11

D. 12:18:22

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 6:9, b:c = 9:11 ⇒ a:b:c = 6:9:11.

This question belongs to: Maths Ratio and Proportion

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