If a:b = 8:7 and b:c = 7:12, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 8:7 and b:c = 7:12, then a:b:c = ?

A. 8:7:12

B. 7:7:13

C. 8:8:12

D. 16:14:24

Answer: Option A

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 8:7, b:c = 7:12 ⇒ a:b:c = 8:7:12.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Milk and water are in ratio 3:5 in a 587 L mixture. Quantity of milk?

A. 220 L

B. 440 L

C. 367 L

D. 248 L

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Correct Answer: Option A

Explanation:
Total parts = 8. Milk = [3 / (3+5)] × 587 = 220 L.

This question belongs to: Maths Ratio and Proportion

Question #2

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Find the mean proportional between 24 and 32.

A. 54

B. 30

C. 56

D. 27

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Correct Answer: Option D

Explanation:
Mean proportional = √(24 × 32) = √(768) = 27.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 4:7 and b:c = 7:8, then a:b:c = ?

A. 8:14:16

B. 3:7:9

C. 4:7:8

D. 4:8:8

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 4:7, b:c = 7:8 ⇒ a:b:c = 4:7:8.

This question belongs to: Maths Ratio and Proportion

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