If a:b = 3:6 and b:c = 6:7, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 3:6 and b:c = 6:7, then a:b:c = ?

A. 2:6:8

B. 6:12:14

C. 3:7:7

D. 3:6:7

Answer: Option D

Solution (By JKExamLibrary)

Combine ratios: a:b = 3:6, b:c = 6:7 ⇒ a:b:c = 3:6:7.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1 Report Error

If a:b = 7:10 and b:c = 10:9, then a:b:c = ?

A. 14:20:18

B. 7:11:9

C. 6:10:10

D. 7:10:9

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 7:10, b:c = 10:9 ⇒ a:b:c = 7:10:9.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

If a:b = 6:5 and b:c = 5:11, then a:b:c = ?

A. 6:5:11

B. 6:6:11

C. 5:5:12

D. 12:10:22

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 6:5, b:c = 5:11 ⇒ a:b:c = 6:5:11.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

Two numbers are in ratio 9:12. Their difference is 74. What is their sum?

A. 270

B. 355

C. 105

D. 210

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Correct Answer: Option D

Explanation:
Numbers 9k, 12k. Difference |9-12|k = 74 ⇒ k = 24. Sum = (9+12)k ≈ 210.

This question belongs to: Maths Ratio and Proportion

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