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. 47 years

B. 36 years

C. 84 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

If a:b = 8:3 and b:c = 3:9, then a:b:c = ?

A. 16:6:18

B. 8:4:9

C. 8:3:9

D. 7:3:10

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 8:3, b:c = 3:9 ⇒ a:b:c = 8:3:9.

This question belongs to: Maths Ratio and Proportion

Question #2

Find the mean proportional between 25 and 32.

A. 56

B. 28

C. 57

D. 31

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Correct Answer: Option B

Explanation:
Mean proportional = √(25 × 32) = √(800) = 28.

This question belongs to: Maths Ratio and Proportion

Question #3

Milk and water are in ratio 8:6 in a 248 L mixture. Quantity of milk?

A. 107 L

B. 282 L

C. 175 L

D. 141 L

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Correct Answer: Option D

Explanation:
Total parts = 14. Milk = [8 / (8+6)] × 248 = 141 L.

This question belongs to: Maths Ratio and Proportion

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