If a:b = 2:8 and b:c = 8:5, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 2:8 and b:c = 8:5, then a:b:c = ?

A. 2:9:5

B. 4:16:10

C. 2:8:5

D. 1:8:6

Answer: Option C

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 2:8, b:c = 8:5 ⇒ a:b:c = 2:8:5.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Milk and water are in ratio 7:2 in a 578 L mixture. Quantity of milk?

A. 473 L

B. 898 L

C. 449 L

D. 129 L

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Correct Answer: Option C

Explanation:
Total parts = 9. Milk = [7 / (7+2)] × 578 = 449 L.

This question belongs to: Maths Ratio and Proportion

Question #2

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Find the mean proportional between 24 and 76.

A. 100

B. 45

C. 42

D. 84

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Correct Answer: Option C

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

This question belongs to: Maths Ratio and Proportion

Question #3

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

A. 4:7:4

B. 4:8:4

C. 8:14:8

D. 3:7:5

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Correct Answer: Option A

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

This question belongs to: Maths Ratio and Proportion

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