Ratio of present ages of A and B is 7:4. After 7 years, the ratio becomes 10:5. Present age of A is? MCQ with Answer and Explanation

Ratio of present ages of A and B is 7:4. After 7 years, the ratio becomes 10:5. Present age of A is?

A. 84 years

B. 78 years

C. 168 years

D. 89 years

Answer: Option A

Let ages 7k and 4k. Then (7k + 7)/(4k + 7) = 10/5. Solving gives k ≈ 12, age of A = 7*12 = 84.

This question belongs to: Maths Ratio and Proportion

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Question #1 Report Error

Two numbers are in ratio 11:9. Their difference is 111. What is their sum?

A. 480

B. 240

C. 560

D. 526

Correct Answer: Option A

Explanation:
Numbers 11k, 9k. Difference |11-9|k = 111 ⇒ k = 55. Sum = (11+9)k ≈ 480.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

If a:b = 6:7 and b:c = 7:10, then a:b:c = ?

A. 6:7:10

B. 6:8:10

C. 12:14:20

D. 5:7:11

Correct Answer: Option A

Explanation:
Combine ratios: a:b = 6:7, b:c = 7:10 ⇒ a:b:c = 6:7:10.

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. 362 L

B. 181 L

C. 210 L

D. 68 L

Correct Answer: Option B

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

This question belongs to: Maths Ratio and Proportion