Ratio of present ages of A and B is 3:5. After 5 years, the ratio becomes 5:6. Present age of A is? MCQ with Answer and Explanation

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Ratio of present ages of A and B is 3:5. After 5 years, the ratio becomes 5:6. Present age of A is?

A. 84 years

B. 42 years

C. 47 years

D. 36 years

Answer: Option B

Solution (By JKSSB Mock Tests)

Let ages 3k and 5k. Then (3k + 5)/(5k + 5) = 5/6. Solving gives k ≈ 14, age of A = 3*14 = 42.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

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

A. 7:7:9

B. 14:14:18

C. 7:8:9

D. 6:7:10

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Correct Answer: Option A

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

This question belongs to: Maths Ratio and Proportion

Question #2

If a:b = 5:8 and b:c = 8:6, then a:b:c = ?

A. 5:9:6

B. 5:8:6

C. 10:16:12

D. 4:8:7

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 5:8, b:c = 8:6 ⇒ a:b:c = 5:8:6.

This question belongs to: Maths Ratio and Proportion

Question #3

If a:b = 7:9 and b:c = 9:8, then a:b:c = ?

A. 6:9:9

B. 7:9:8

C. 14:18:16

D. 7:10:8

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 7:9, b:c = 9:8 ⇒ a:b:c = 7:9:8.

This question belongs to: Maths Ratio and Proportion

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