If a:b = 3:7 and b:c = 7:9, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 3:7 and b:c = 7:9, then a:b:c = ?

A. 3:7:9

B. 2:7:10

C. 6:14:18

D. 3:8:9

Answer: Option A

Solution (By JKExamLibrary)

Combine ratios: a:b = 3:7, b:c = 7:9 ⇒ a:b:c = 3:7:9.

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 = 2:8 and b:c = 8:5, then a:b:c = ?

A. 1:8:6

B. 2:8:5

C. 4:16:10

D. 2:9:5

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 2:8, b:c = 8:5 ⇒ a:b:c = 2:8:5.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

Find the mean proportional between 25 and 32.

A. 57

B. 31

C. 28

D. 56

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Correct Answer: Option C

Explanation:
Mean proportional = √(25 × 32) = √(800) = 28.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

If a:b = 4:6 and b:c = 6:9, then a:b:c = ?

A. 4:6:9

B. 8:12:18

C. 4:7:9

D. 3:6:10

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
Combine ratios: a:b = 4:6, b:c = 6:9 ⇒ a:b:c = 4:6:9.

This question belongs to: Maths Ratio and Proportion

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