If a:b = 3:10 and b:c = 10:11, then a:b:c = ? MCQ with Answer and Explanation

If a:b = 3:10 and b:c = 10:11, then a:b:c = ?

A. 2:10:12

B. 3:10:11

C. 3:11:11

D. 6:20:22

Answer: Option B

Combine ratios: a:b = 3:10, b:c = 10:11 ⇒ a:b:c = 3:10:11.

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. 65 years

B. 138 years

C. 69 years

D. 74 years

Correct Answer: Option C

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

Milk and water are in ratio 7:6 in a 528 L mixture. Quantity of milk?

A. 568 L

B. 284 L

C. 334 L

D. 244 L

Correct Answer: Option B

Explanation:
Total parts = 13. Milk = [7 / (7+6)] × 528 = 284 L.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

Ratio of present ages of A and B is 7:5. After 12 years, the ratio becomes 8:8. Present age of A is?

A. 98 years

B. 196 years

C. 103 years

D. 94 years

Correct Answer: Option A

Explanation:
Let ages 7k and 5k. Then (7k + 12)/(5k + 12) = 8/8. Solving gives k ≈ 14, age of A = 7*14 = 98.

This question belongs to: Maths Ratio and Proportion