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

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

A. 2:6:10

B. 3:7:9

C. 3:6:9

D. 6:12:18

Answer: Option C

Solution (By JKSSB Mock Tests)

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

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

A. 7:10:9

B. 14:20:18

C. 6:10:10

D. 7:11:9

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Correct Answer: Option A

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

If a:b = 4:6 and b:c = 6:12, then a:b:c = ?

A. 4:6:12

B. 3:6:13

C. 4:7:12

D. 8:12:24

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 4:6, b:c = 6:12 ⇒ a:b:c = 4:6:12.

This question belongs to: Maths Ratio and Proportion

Question #3

Find the mean proportional between 20 and 74.

A. 76

B. 38

C. 41

D. 94

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Correct Answer: Option B

Explanation:
Mean proportional = √(20 × 74) = √(1480) = 38.

This question belongs to: Maths Ratio and Proportion

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