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

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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. 336 years

B. 161 years

C. 168 years

D. 173 years

Answer: Option C

Solution (By JKSSB Mock Tests)

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

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Practice More Ratio and Proportion Questions

Question #1

If a:b = 5:4 and b:c = 4:6, then a:b:c = ?

A. 4:4:7

B. 5:5:6

C. 5:4:6

D. 10:8:12

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 5:4, b:c = 4:6 ⇒ a:b:c = 5:4:6.

This question belongs to: Maths Ratio and Proportion

Question #2

Milk and water are in ratio 6:4 in a 289 L mixture. Quantity of milk?

A. 223 L

B. 116 L

C. 346 L

D. 173 L

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Correct Answer: Option D

Explanation:
Total parts = 10. Milk = [6 / (6+4)] × 289 = 173 L.

This question belongs to: Maths Ratio and Proportion

Question #3

If a:b = 7:5 and b:c = 5:9, then a:b:c = ?

A. 14:10:18

B. 6:5:10

C. 7:6:9

D. 7:5:9

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 7:5, b:c = 5:9 ⇒ a:b:c = 7:5:9.

This question belongs to: Maths Ratio and Proportion

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