If a:b = 2:8 and b:c = 8:11, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 2:8 and b:c = 8:11, then a:b:c = ?

A. 1:8:12

B. 2:8:11

C. 4:16:22

D. 2:9:11

Answer: Option B

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 2:8, b:c = 8:11 ⇒ a:b:c = 2:8:11.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in the ratio 10:5 and their sum is 127. Find the numbers.

A. 80 and 40

B. 160 and 80

C. 92 and 20

D. 61 and 55

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Correct Answer: Option A

Explanation:
Numbers = 10k and 5k. 10k + 5k = 127 ⇒ k = 8. Thus, numbers are 80 and 40.

This question belongs to: Maths Ratio and Proportion

Question #2

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Find the mean proportional between 20 and 62.

A. 38

B. 35

C. 70

D. 82

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Correct Answer: Option B

Explanation:
Mean proportional = √(20 × 62) = √(1240) = 35.

This question belongs to: Maths Ratio and Proportion

Question #3

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Find the mean proportional between 24 and 76.

A. 45

B. 42

C. 84

D. 100

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Correct Answer: Option B

Explanation:
Mean proportional = √(24 × 76) = √(1824) = 42.

This question belongs to: Maths Ratio and Proportion

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