Ratio of present ages of A and B is 7:8. After 11 years, the ratio becomes 8:9. Present age of A is? MCQ with Answer and Explanation

Ratio of present ages of A and B is 7:8. After 11 years, the ratio becomes 8:9. Present age of A is?

A. 131 years

B. 252 years

C. 126 years

D. 119 years

Answer: Option C

Let ages 7k and 8k. Then (7k + 11)/(8k + 11) = 8/9. Solving gives k ≈ 18, age of A = 7*18 = 126.

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 5:6. After 9 years, the ratio becomes 7:7. Present age of A is?

A. 105 years

B. 95 years

C. 100 years

D. 200 years

Correct Answer: Option C

Explanation:
Let ages 5k and 6k. Then (5k + 9)/(6k + 9) = 7/7. Solving gives k ≈ 20, age of A = 5*20 = 100.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

Find the mean proportional between 7 and 28.

A. 35

B. 17

C. 14

D. 28

Correct Answer: Option C

Explanation:
Mean proportional = √(7 × 28) = √(196) = 14.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

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

A. 90 years

B. 45 years

C. 50 years

D. 39 years

Correct Answer: Option B

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

This question belongs to: Maths Ratio and Proportion