If a:b = 2:3 and b:c = 3:5, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 2:3 and b:c = 3:5, then a:b:c = ?

A. 1:3:6

B. 2:4:5

C. 4:6:10

D. 2:3:5

Answer: Option D

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 2:3, b:c = 3:5 ⇒ a:b:c = 2:3:5.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in ratio 9:7. Their difference is 120. What is their sum?

A. 400

B. 200

C. 489

D. 445

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Correct Answer: Option A

Explanation:
Numbers 9k, 7k. Difference |9-7|k = 120 ⇒ k = 60. Sum = (9+7)k ≈ 400.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 5:4 and b:c = 4:4, then a:b:c = ?

A. 10:8:8

B. 4:4:5

C. 5:4:4

D. 5:5:4

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 5:4, b:c = 4:4 ⇒ a:b:c = 5:4:4.

This question belongs to: Maths Ratio and Proportion

Question #3

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Find the mean proportional between 11 and 38.

A. 49

B. 40

C. 20

D. 23

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Correct Answer: Option C

Explanation:
Mean proportional = √(11 × 38) = √(418) = 20.

This question belongs to: Maths Ratio and Proportion

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