Ratio of present ages of A and B is 3:8. After 12 years, the ratio becomes 4:11. Present age of A is? MCQ with Answer and Explanation

Ratio of present ages of A and B is 3:8. After 12 years, the ratio becomes 4:11. Present age of A is?

A. 74 years

B. 69 years

C. 138 years

D. 65 years

Answer: Option B

Let ages 3k and 8k. Then (3k + 12)/(8k + 12) = 4/11. Solving gives k ≈ 23, age of A = 3*23 = 69.

This question belongs to: Maths Ratio and Proportion

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Question #1 Report Error

Ratio of present ages of A and B is 5:7. After 12 years, the ratio becomes 7:10. Present age of A is?

A. 90 years

B. 85 years

C. 81 years

D. 170 years

Correct Answer: Option B

Explanation:
Let ages 5k and 7k. Then (5k + 12)/(7k + 12) = 7/10. Solving gives k ≈ 17, age of A = 5*17 = 85.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

If a:b = 5:8 and b:c = 8:12, then a:b:c = ?

A. 5:8:12

B. 4:8:13

C. 5:9:12

D. 10:16:24

Correct Answer: Option A

Explanation:
Combine ratios: a:b = 5:8, b:c = 8:12 ⇒ a:b:c = 5:8:12.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

Milk and water are in ratio 9:4 in a 207 L mixture. Quantity of milk?

A. 143 L

B. 176 L

C. 286 L

D. 64 L

Correct Answer: Option A

Explanation:
Total parts = 13. Milk = [9 / (9+4)] × 207 = 143 L.

This question belongs to: Maths Ratio and Proportion