If a:b = 3:10 and b:c = 10:11, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 3:10 and b:c = 10:11, then a:b:c = ?

A. 6:20:22

B. 2:10:12

C. 3:10:11

D. 3:11:11

Answer: Option C

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 3:10, b:c = 10:11 ⇒ a:b:c = 3:10:11.

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 11 and 38.

A. 20

B. 23

C. 49

D. 40

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Correct Answer: Option A

Explanation:
Mean proportional = √(11 × 38) = √(418) = 20.

This question belongs to: Maths Ratio and Proportion

Question #2

Two numbers are in ratio 7:5. Their difference is 102. What is their sum?

A. 252

B. 647

C. 546

D. 612

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Correct Answer: Option D

This question belongs to: Maths Ratio and Proportion

Question #3

Ratio of present ages of A and B is 7:5. After 7 years, the ratio becomes 10:8. Present age of A is?

A. 126 years

B. 131 years

C. 252 years

D. 123 years

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Correct Answer: Option A

Explanation:
Let ages 7k and 5k. Then (7k + 7)/(5k + 7) = 10/8. Solving gives k ≈ 18, age of A = 7*18 = 126.

This question belongs to: Maths Ratio and Proportion

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