If a:b = 3:5 and b:c = 5:5, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 3:5 and b:c = 5:5, then a:b:c = ?

A. 3:6:5

B. 3:5:5

C. 6:10:10

D. 2:5:6

Answer: Option B

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 3:5, b:c = 5:5 ⇒ a:b:c = 3:5:5.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

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

A. 3:4:6

B. 3:3:6

C. 2:3:7

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 #2

Two numbers are in ratio 9:7. Their difference is 120. What is their sum?

A. 489

B. 445

C. 400

D. 200

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Correct Answer: Option C

Explanation:
Numbers 9k, 7k. Difference |9-7|k = 120 ⇒ k = 60. Sum = (9+7)k ≈ 400.

This question belongs to: Maths Ratio and Proportion

Question #3

Find the mean proportional between 4 and 21.

A. 18

B. 12

C. 9

D. 25

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Correct Answer: Option C

Explanation:
Mean proportional = √(4 × 21) = √(84) = 9.

This question belongs to: Maths Ratio and Proportion

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