If a:b = 3:10 and b:c = 10:5, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 3:10 and b:c = 10:5, then a:b:c = ?

A. 3:11:5

B. 6:20:10

C. 3:10:5

D. 2:10:6

Answer: Option C

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 3:10, b:c = 10:5 ⇒ a:b:c = 3:10:5.

This question belongs to: Maths Ratio and Proportion

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Question #1

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

A. 3:6:7

B. 3:7:7

C. 6:12:14

D. 2:6:8

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Correct Answer: Option A

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

This question belongs to: Maths Ratio and Proportion

Question #2

If a:b = 4:10 and b:c = 10:12, then a:b:c = ?

A. 4:11:12

B. 4:10:12

C. 8:20:24

D. 3:10:13

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 4:10, b:c = 10:12 ⇒ a:b:c = 4:10:12.

This question belongs to: Maths Ratio and Proportion

Question #3

Find the mean proportional between 20 and 74.

A. 76

B. 94

C. 41

D. 38

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Correct Answer: Option D

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

This question belongs to: Maths Ratio and Proportion

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