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

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

A. 42 years

B. 45 years

C. 90 years

D. 50 years

Answer: Option B

Let ages 5k and 7k. Then (5k + 4)/(7k + 4) = 8/8. 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 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

Correct Answer: Option A

Explanation:
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

Question #2 Report Error

Ratio of present ages of A and B is 4:6. After 10 years, the ratio becomes 7:8. Present age of A is?

A. 37 years

B. 32 years

C. 64 years

D. 26 years

Correct Answer: Option B

Explanation:
Let ages 4k and 6k. Then (4k + 10)/(6k + 10) = 7/8. Solving gives k ≈ 8, age of A = 4*8 = 32.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

Milk and water are in ratio 8:3 in a 249 L mixture. Quantity of milk?

A. 181 L

B. 362 L

C. 210 L

D. 68 L

Correct Answer: Option A

Explanation:
Total parts = 11. Milk = [8 / (8+3)] × 249 = 181 L.

This question belongs to: Maths Ratio and Proportion