If a:b = 3:8 and b:c = 8:4, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 3:8 and b:c = 8:4, then a:b:c = ?

A. 2:8:5

B. 3:8:4

C. 3:9:4

D. 6:16:8

Answer: Option B

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 3:8, b:c = 8:4 ⇒ a:b:c = 3:8:4.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in the ratio 4:3 and their sum is 631. Find the numbers.

A. 347 and 287

B. 380 and 258

C. 360 and 270

D. 720 and 540

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Correct Answer: Option C

Explanation:
Numbers = 4k and 3k. 4k + 3k = 631 ⇒ k = 90. Thus, numbers are 360 and 270.

This question belongs to: Maths Ratio and Proportion

Question #2

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Find the mean proportional between 34 and 17.

A. 24

B. 51

C. 48

D. 27

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Correct Answer: Option A

Explanation:
Mean proportional = √(34 × 17) = √(578) = 24.

This question belongs to: Maths Ratio and Proportion

Question #3

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Find the mean proportional between 20 and 36.

A. 52

B. 56

C. 26

D. 29

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Correct Answer: Option C

Explanation:
Mean proportional = √(20 × 36) = √(720) = 26.

This question belongs to: Maths Ratio and Proportion

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