Ratio of present ages of A and B is 4:7. After 11 years, the ratio becomes 5:8. Present age of A is? MCQ with Answer and Explanation

Ratio of present ages of A and B is 4:7. After 11 years, the ratio becomes 5:8. Present age of A is?

A. 40 years

B. 45 years

C. 36 years

D. 80 years

Answer: Option A

Let ages 4k and 7k. Then (4k + 11)/(7k + 11) = 5/8. Solving gives k ≈ 10, age of A = 4*10 = 40.

This question belongs to: Maths Ratio and Proportion

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Question #1 Report Error

Two numbers are in the ratio 5:3 and their sum is 449. Find the numbers.

A. 296 and 147

B. 274 and 173

C. 280 and 168

D. 560 and 336

Correct Answer: Option C

Explanation:
Numbers = 5k and 3k. 5k + 3k = 449 ⇒ k = 56. Thus, numbers are 280 and 168.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

If a:b = 5:6 and b:c = 6:11, then a:b:c = ?

A. 4:6:12

B. 5:6:11

C. 5:7:11

D. 10:12:22

Correct Answer: Option B

Explanation:
Combine ratios: a:b = 5:6, b:c = 6:11 ⇒ a:b:c = 5:6:11.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

If a:b = 8:3 and b:c = 3:4, then a:b:c = ?

A. 7:3:5

B. 8:3:4

C. 8:4:4

D. 16:6:8

Correct Answer: Option B

Explanation:
Combine ratios: a:b = 8:3, b:c = 3:4 ⇒ a:b:c = 8:3:4.

This question belongs to: Maths Ratio and Proportion