If a:b = 4:5 and b:c = 5:8, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 4:5 and b:c = 5:8, then a:b:c = ?

A. 4:5:8

B. 8:10:16

C. 3:5:9

D. 4:6:8

Answer: Option A

Solution (By JKExamLibrary)

Combine ratios: a:b = 4:5, b:c = 5:8 ⇒ a:b:c = 4:5:8.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1 Report Error

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

A. 2:6:10

B. 3:6:9

C. 6:12:18

D. 3:7:9

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 3:6, b:c = 6:9 ⇒ a:b:c = 3:6:9.

This question belongs to: Maths Ratio and Proportion

Question #2 Report Error

Find the mean proportional between 17 and 42.

A. 29

B. 59

C. 26

D. 52

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Correct Answer: Option C

Explanation:
Mean proportional = √(17 × 42) = √(714) = 26.

This question belongs to: Maths Ratio and Proportion

Question #3 Report Error

If a:b = 5:8 and b:c = 8:12, then a:b:c = ?

A. 5:9:12

B. 10:16:24

C. 4:8:13

D. 5:8:12

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 5:8, b:c = 8:12 ⇒ a:b:c = 5:8:12.

This question belongs to: Maths Ratio and Proportion

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