If a:b = 3:5 and b:c = 5:9, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 3:5 and b:c = 5:9, then a:b:c = ?

A. 3:5:9

B. 2:5:10

C. 3:6:9

D. 6:10:18

Answer: Option A

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 3:5, b:c = 5:9 ⇒ a:b:c = 3:5:9.

This question belongs to: Maths Ratio and Proportion

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Question #1

If a:b = 8:6 and b:c = 6:9, then a:b:c = ?

A. 7:6:10

B. 8:7:9

C. 8:6:9

D. 16:12:18

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 8:6, b:c = 6:9 ⇒ a:b:c = 8:6:9.

This question belongs to: Maths Ratio and Proportion

Question #2

Find the mean proportional between 7 and 35.

A. 15

B. 42

C. 30

D. 18

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Correct Answer: Option A

Explanation:
Mean proportional = √(7 × 35) = √(245) = 15.

This question belongs to: Maths Ratio and Proportion

Question #3

If a:b = 2:6 and b:c = 6:9, then a:b:c = ?

A. 1:6:10

B. 4:12:18

C. 2:7:9

D. 2:6:9

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 2:6, b:c = 6:9 ⇒ a:b:c = 2:6:9.

This question belongs to: Maths Ratio and Proportion

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