Ratio of present ages of A and B is 3:6. After 11 years, the ratio becomes 5:9. Present age of A is? MCQ with Answer and Explanation

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Ratio of present ages of A and B is 3:6. After 11 years, the ratio becomes 5:9. Present age of A is?

A. 57 years

B. 114 years

C. 49 years

D. 62 years

Answer: Option A

Solution (By JKSSB Mock Tests)

Let ages 3k and 6k. Then (3k + 11)/(6k + 11) = 5/9. Solving gives k ≈ 19, age of A = 3*19 = 57.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Ratio of present ages of A and B is 3:7. After 5 years, the ratio becomes 5:10. Present age of A is?

A. 72 years

B. 77 years

C. 65 years

D. 144 years

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Correct Answer: Option A

Explanation:
Let ages 3k and 7k. Then (3k + 5)/(7k + 5) = 5/10. Solving gives k ≈ 24, age of A = 3*24 = 72.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 7:4 and b:c = 4:10, then a:b:c = ?

A. 14:8:20

B. 7:4:10

C. 6:4:11

D. 7:5:10

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 7:4, b:c = 4:10 ⇒ a:b:c = 7:4:10.

This question belongs to: Maths Ratio and Proportion

Question #3

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Milk and water are in ratio 8:3 in a 249 L mixture. Quantity of milk?

A. 181 L

B. 362 L

C. 210 L

D. 68 L

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Correct Answer: Option A

Explanation:
Total parts = 11. Milk = [8 / (8+3)] × 249 = 181 L.

This question belongs to: Maths Ratio and Proportion

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