If a:b = 3:9 and b:c = 9:12, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 3:9 and b:c = 9:12, then a:b:c = ?

A. 3:10:12

B. 3:9:12

C. 6:18:24

D. 2:9:13

Answer: Option B

Solution (By JKExamLibrary)

Combine ratios: a:b = 3:9, b:c = 9:12 ⇒ a:b:c = 3:9:12.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1 Report Error

Find the mean proportional between 30 and 37.

A. 33

B. 66

C. 36

D. 67

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Correct Answer: Option A

Explanation:
Mean proportional = √(30 × 37) = √(1110) = 33.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

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

A. 14:20:18

B. 6:10:10

C. 7:10:9

D. 7:11:9

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Correct Answer: Option C

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 #3 Report Error

If a:b = 6:9 and b:c = 9:10, then a:b:c = ?

A. 6:9:10

B. 12:18:20

C. 6:10:10

D. 5:9:11

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
Combine ratios: a:b = 6:9, b:c = 9:10 ⇒ a:b:c = 6:9:10.

This question belongs to: Maths Ratio and Proportion

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