If a:b = 2:9 and b:c = 9:7, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 2:9 and b:c = 9:7, then a:b:c = ?

A. 2:10:7

B. 2:9:7

C. 1:9:8

D. 4:18:14

Answer: Option B

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 2:9, b:c = 9:7 ⇒ a:b:c = 2:9:7.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in the ratio 10:4 and their sum is 482. Find the numbers.

A. 340 and 136

B. 323 and 146

C. 680 and 272

D. 357 and 117

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Correct Answer: Option A

Explanation:
Numbers = 10k and 4k. 10k + 4k = 482 ⇒ k = 34. Thus, numbers are 340 and 136.

This question belongs to: Maths Ratio and Proportion

Question #2

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Ratio of present ages of A and B is 4:6. After 9 years, the ratio becomes 7:8. Present age of A is?

A. 88 years

B. 83 years

C. 176 years

D. 93 years

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Correct Answer: Option A

Explanation:
Let ages 4k and 6k. Then (4k + 9)/(6k + 9) = 7/8. Solving gives k ≈ 22, age of A = 4*22 = 88.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 5:6 and b:c = 6:9, then a:b:c = ?

A. 10:12:18

B. 5:6:9

C. 5:7:9

D. 4:6:10

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 5:6, b:c = 6:9 ⇒ a:b:c = 5:6:9.

This question belongs to: Maths Ratio and Proportion

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