If a:b = 7:7 and b:c = 7:9, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 7:7 and b:c = 7:9, then a:b:c = ?

A. 7:8:9

B. 7:7:9

C. 6:7:10

D. 14:14:18

Answer: Option B

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 7:7, b:c = 7:9 ⇒ a:b:c = 7:7:9.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Milk and water are in ratio 6:4 in a 289 L mixture. Quantity of milk?

A. 173 L

B. 346 L

C. 116 L

D. 223 L

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Correct Answer: Option A

Explanation:
Total parts = 10. Milk = [6 / (6+4)] × 289 = 173 L.

This question belongs to: Maths Ratio and Proportion

Question #2

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

A. 2:3:7

B. 3:3:6

C. 3:4:6

D. 6:6:12

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Correct Answer: Option B

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

This question belongs to: Maths Ratio and Proportion

Question #3

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Find the mean proportional between 24 and 76.

A. 42

B. 84

C. 45

D. 100

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Correct Answer: Option A

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

This question belongs to: Maths Ratio and Proportion

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