If a:b = 3:6 and b:c = 6:9, then a:b:c = ? MCQ with Answer and Explanation

If a:b = 3:6 and b:c = 6:9, then a:b:c = ?

A. 6:12:18

B. 3:6:9

C. 3:7:9

D. 2:6:10

Answer: Option B

Combine ratios: a:b = 3:6, b:c = 6:9 ⇒ a:b:c = 3:6:9.

This question belongs to: Maths Ratio and Proportion

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Question #1 Report Error

Two numbers are in ratio 6:12. Their difference is 108. What is their sum?

A. 554

B. 414

C. 207

D. 447

Correct Answer: Option B

Explanation:
Numbers 6k, 12k. Difference |6-12|k = 108 ⇒ k = 18. Sum = (6+12)k ≈ 414.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

Two numbers are in ratio 9:7. Their difference is 120. What is their sum?

A. 200

B. 445

C. 489

D. 400

Correct Answer: Option D

Explanation:
Numbers 9k, 7k. Difference |9-7|k = 120 ⇒ k = 60. Sum = (9+7)k ≈ 400.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

Milk and water are in ratio 7:2 in a 578 L mixture. Quantity of milk?

A. 898 L

B. 129 L

C. 449 L

D. 473 L

Correct Answer: Option C

Explanation:
Total parts = 9. Milk = [7 / (7+2)] × 578 = 449 L.

This question belongs to: Maths Ratio and Proportion