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

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

A. 7:5:5

B. 16:10:8

C. 8:5:4

D. 8:6:4

Answer: Option C

Solution (By JKExamLibrary)

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

This question belongs to: Maths Ratio and Proportion

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Question #1

If a:b = 3:4 and b:c = 4:11, then a:b:c = ?

A. 6:8:22

B. 3:4:11

C. 3:5:11

D. 2:4:12

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 3:4, b:c = 4:11 ⇒ a:b:c = 3:4:11.

This question belongs to: Maths Ratio and Proportion

Question #2

Two numbers are in the ratio 11:3 and their sum is 121. Find the numbers.

A. 176 and 48

B. 73 and 38

C. 106 and 7

D. 88 and 24

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Correct Answer: Option D

Explanation:
Numbers = 11k and 3k. 11k + 3k = 121 ⇒ k = 8. Thus, numbers are 88 and 24.

This question belongs to: Maths Ratio and Proportion

Question #3

Find the mean proportional between 10 and 48.

A. 21

B. 58

C. 42

D. 24

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Correct Answer: Option A

Explanation:
Mean proportional = √(10 × 48) = √(480) = 21.

This question belongs to: Maths Ratio and Proportion

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