Ratio of present ages of A and B is 5:6. After 9 years, the ratio becomes 7:7. Present age of A is? MCQ with Answer and Explanation

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Ratio of present ages of A and B is 5:6. After 9 years, the ratio becomes 7:7. Present age of A is?

A. 105 years

B. 200 years

C. 100 years

D. 95 years

Answer: Option C

Solution (By JKSSB Mock Tests)

Let ages 5k and 6k. Then (5k + 9)/(6k + 9) = 7/7. Solving gives k ≈ 20, age of A = 5*20 = 100.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

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

A. 16:6:16

B. 7:3:9

C. 8:3:8

D. 8:4:8

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Correct Answer: Option C

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

This question belongs to: Maths Ratio and Proportion

Question #2

Find the mean proportional between 4 and 66.

A. 70

B. 32

C. 16

D. 19

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Correct Answer: Option C

Explanation:
Mean proportional = √(4 × 66) = √(264) = 16.

This question belongs to: Maths Ratio and Proportion

Question #3

If a:b = 2:6 and b:c = 6:12, then a:b:c = ?

A. 2:6:12

B. 1:6:13

C. 2:7:12

D. 4:12:24

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 2:6, b:c = 6:12 ⇒ a:b:c = 2:6:12.

This question belongs to: Maths Ratio and Proportion

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