If a:b = 2:5 and b:c = 5:10, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 2:5 and b:c = 5:10, then a:b:c = ?

A. 2:6:10

B. 2:5:10

C. 4:10:20

D. 1:5:11

Answer: Option B

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 2:5, b:c = 5:10 ⇒ a:b:c = 2:5:10.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

Find the mean proportional between 28 and 49.

A. 37

B. 77

C. 74

D. 40

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Correct Answer: Option A

Explanation:
Mean proportional = √(28 × 49) = √(1372) = 37.

This question belongs to: Maths Ratio and Proportion

Question #2

Find the mean proportional between 19 and 77.

A. 41

B. 76

C. 96

D. 38

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Correct Answer: Option D

Explanation:
Mean proportional = √(19 × 77) = √(1463) = 38.

This question belongs to: Maths Ratio and Proportion

Question #3

If a:b = 4:10 and b:c = 10:5, then a:b:c = ?

A. 4:11:5

B. 3:10:6

C. 4:10:5

D. 8:20:10

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 4:10, b:c = 10:5 ⇒ a:b:c = 4:10:5.

This question belongs to: Maths Ratio and Proportion

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