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. 36 years

C. 47 years

D. 42 years

Answer: Option D

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

Find the mean proportional between 10 and 48.

A. 58

B. 24

C. 21

D. 42

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Correct Answer: Option C

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

This question belongs to: Maths Ratio and Proportion

Question #2

Ratio of present ages of A and B is 7:4. After 9 years, the ratio becomes 10:5. Present age of A is?

A. 173 years

B. 168 years

C. 336 years

D. 161 years

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Correct Answer: Option B

Explanation:
Let ages 7k and 4k. Then (7k + 9)/(4k + 9) = 10/5. Solving gives k ≈ 24, age of A = 7*24 = 168.

This question belongs to: Maths Ratio and Proportion

Question #3

If a:b = 5:10 and b:c = 10:4, then a:b:c = ?

A. 4:10:5

B. 10:20:8

C. 5:11:4

D. 5:10:4

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 5:10, b:c = 10:4 ⇒ a:b:c = 5:10:4.

This question belongs to: Maths Ratio and Proportion

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