If a:b = 5:7 and b:c = 7:5, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 5:7 and b:c = 7:5, then a:b:c = ?

A. 5:7:5

B. 4:7:6

C. 10:14:10

D. 5:8:5

Answer: Option A

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 5:7, b:c = 7:5 ⇒ a:b:c = 5:7:5.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Milk and water are in ratio 8:6 in a 248 L mixture. Quantity of milk?

A. 175 L

B. 282 L

C. 107 L

D. 141 L

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Correct Answer: Option D

Explanation:
Total parts = 14. Milk = [8 / (8+6)] × 248 = 141 L.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 2:4 and b:c = 4:7, then a:b:c = ?

A. 2:5:7

B. 2:4:7

C. 1:4:8

D. 4:8:14

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 2:4, b:c = 4:7 ⇒ a:b:c = 2:4:7.

This question belongs to: Maths Ratio and Proportion

Question #3

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Find the mean proportional between 14 and 40.

A. 23

B. 26

C. 54

D. 46

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Correct Answer: Option A

Explanation:
Mean proportional = √(14 × 40) = √(560) = 23.

This question belongs to: Maths Ratio and Proportion

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