Ratio of present ages of A and B is 4:8. After 6 years, the ratio becomes 5:10. Present age of A is? MCQ with Answer and Explanation

Ratio of present ages of A and B is 4:8. After 6 years, the ratio becomes 5:10. Present age of A is?

A. 56 years

B. 61 years

C. 52 years

D. 112 years

Answer: Option A

Let ages 4k and 8k. Then (4k + 6)/(8k + 6) = 5/10. Solving gives k ≈ 14, age of A = 4*14 = 56.

This question belongs to: Maths Ratio and Proportion

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Question #1 Report Error

Milk and water are in ratio 4:7 in a 249 L mixture. Quantity of milk?

A. 159 L

B. 180 L

C. 137 L

D. 90 L

Correct Answer: Option D

Explanation:
Total parts = 11. Milk = [4 / (4+7)] × 249 = 90 L.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

Find the mean proportional between 24 and 32.

A. 54

B. 30

C. 56

D. 27

Correct Answer: Option D

Explanation:
Mean proportional = √(24 × 32) = √(768) = 27.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

If a:b = 4:8 and b:c = 8:7, then a:b:c = ?

A. 8:16:14

B. 3:8:8

C. 4:9:7

D. 4:8:7

Correct Answer: Option D

Explanation:
Combine ratios: a:b = 4:8, b:c = 8:7 ⇒ a:b:c = 4:8:7.

This question belongs to: Maths Ratio and Proportion