Ratio of present ages of A and B is 5:4. After 4 years, the ratio becomes 6:7. Present age of A is? MCQ with Answer and Explanation

Ratio of present ages of A and B is 5:4. After 4 years, the ratio becomes 6:7. Present age of A is?

A. 50 years

B. 45 years

C. 42 years

D. 90 years

Answer: Option B

Let ages 5k and 4k. Then (5k + 4)/(4k + 4) = 6/7. Solving gives k ≈ 9, age of A = 5*9 = 45.

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 3:8. After 12 years, the ratio becomes 4:11. Present age of A is?

A. 74 years

B. 65 years

C. 138 years

D. 69 years

Correct Answer: Option D

Explanation:
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

Question #2 Report Error

If a:b = 7:6 and b:c = 6:7, then a:b:c = ?

A. 14:12:14

B. 6:6:8

C. 7:6:7

D. 7:7:7

Correct Answer: Option C

Explanation:
Combine ratios: a:b = 7:6, b:c = 6:7 ⇒ a:b:c = 7:6:7.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

Two numbers are in the ratio 7:8 and their sum is 572. Find the numbers.

A. 246 and 324

B. 532 and 608

C. 296 and 283

D. 266 and 304

Correct Answer: Option D

Explanation:
Numbers = 7k and 8k. 7k + 8k = 572 ⇒ k = 38. Thus, numbers are 266 and 304.

This question belongs to: Maths Ratio and Proportion