If a:b = 2:3 and b:c = 3:11, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 2:3 and b:c = 3:11, then a:b:c = ?

A. 4:6:22

B. 2:3:11

C. 2:4:11

D. 1:3:12

Answer: Option B

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 2:3, b:c = 3:11 ⇒ a:b:c = 2:3:11.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Ratio of present ages of A and B is 6:4. After 9 years, the ratio becomes 9:6. Present age of A is?

A. 95 years

B. 180 years

C. 90 years

D. 83 years

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Correct Answer: Option C

Explanation:
Let ages 6k and 4k. Then (6k + 9)/(4k + 9) = 9/6. Solving gives k ≈ 15, age of A = 6*15 = 90.

This question belongs to: Maths Ratio and Proportion

Question #2

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Find the mean proportional between 4 and 66.

A. 19

B. 70

C. 32

D. 16

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Correct Answer: Option D

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

This question belongs to: Maths Ratio and Proportion

Question #3

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

A. 3:10:11

B. 2:10:12

C. 3:11:11

D. 6:20:22

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Correct Answer: Option A

Explanation:
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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