If a:b = 2:9 and b:c = 9:4, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 2:9 and b:c = 9:4, then a:b:c = ?

A. 4:18:8

B. 2:10:4

C. 1:9:5

D. 2:9:4

Answer: Option D

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 2:9, b:c = 9:4 ⇒ a:b:c = 2:9:4.

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 5:8. After 6 years, the ratio becomes 6:11. Present age of A is?

A. 160 years

B. 74 years

C. 85 years

D. 80 years

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Correct Answer: Option D

Explanation:
Let ages 5k and 8k. Then (5k + 6)/(8k + 6) = 6/11. Solving gives k ≈ 16, age of A = 5*16 = 80.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 8:7 and b:c = 7:6, then a:b:c = ?

A. 8:8:6

B. 8:7:6

C. 7:7:7

D. 16:14:12

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 8:7, b:c = 7:6 ⇒ a:b:c = 8:7:6.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 2:3 and b:c = 3:9, then a:b:c = ?

A. 1:3:10

B. 2:3:9

C. 2:4:9

D. 4:6:18

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 2:3, b:c = 3:9 ⇒ a:b:c = 2:3:9.

This question belongs to: Maths Ratio and Proportion

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