If a:b = 4:5 and b:c = 5:4, then a:b:c = ? MCQ with Answer and Explanation

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

A. 4:6:4

B. 3:5:5

C. 8:10:8

D. 4:5:4

Answer: Option D

Solution (By JKSSB Mock Tests)

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

This question belongs to: Maths Ratio and Proportion

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Question #1

If a:b = 4:9 and b:c = 9:11, then a:b:c = ?

A. 4:10:11

B. 8:18:22

C. 4:9:11

D. 3:9:12

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 4:9, b:c = 9:11 ⇒ a:b:c = 4:9:11.

This question belongs to: Maths Ratio and Proportion

Question #2

Find the mean proportional between 7 and 28.

A. 28

B. 17

C. 14

D. 35

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Correct Answer: Option C

Explanation:
Mean proportional = √(7 × 28) = √(196) = 14.

This question belongs to: Maths Ratio and Proportion

Question #3

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

A. 7:10:9

B. 6:10:10

C. 7:11:9

D. 14:20:18

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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

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