If a:b = 7:5 and b:c = 5:8, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 7:5 and b:c = 5:8, then a:b:c = ?

A. 7:6:8

B. 14:10:16

C. 7:5:8

D. 6:5:9

Answer: Option C

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 7:5, b:c = 5:8 ⇒ a:b:c = 7:5:8.

This question belongs to: Maths Ratio and Proportion

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Question #1

If a:b = 7:6 and b:c = 6:5, then a:b:c = ?

A. 7:6:5

B. 14:12:10

C. 6:6:6

D. 7:7:5

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 7:6, b:c = 6:5 ⇒ a:b:c = 7:6:5.

This question belongs to: Maths Ratio and Proportion

Question #2

Find the mean proportional between 4 and 66.

A. 70

B. 16

C. 19

D. 32

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Correct Answer: Option B

Explanation:
Mean proportional = √(4 × 66) = √(264) = 16.

This question belongs to: Maths Ratio and Proportion

Question #3

Two numbers are in ratio 9:4. Their difference is 40. What is their sum?

A. 714

B. 601

C. 572

D. 286

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Correct Answer: Option C

Explanation:
Numbers 9k, 4k. Difference |9-4|k = 40 ⇒ k = 8. Sum = (9+4)k ≈ 572.

This question belongs to: Maths Ratio and Proportion

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