If a:b = 2:8 and b:c = 8:10, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 2:8 and b:c = 8:10, then a:b:c = ?

A. 2:8:10

B. 1:8:11

C. 4:16:20

D. 2:9:10

Answer: Option A

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 2:8, b:c = 8:10 ⇒ a:b:c = 2:8:10.

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 5:4. After 12 years, the ratio becomes 8:5. Present age of A is?

A. 120 years

B. 230 years

C. 115 years

D. 111 years

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Correct Answer: Option C

Explanation:
Let ages 5k and 4k. Then (5k + 12)/(4k + 12) = 8/5. Solving gives k ≈ 23, age of A = 5*23 = 115.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 3:7 and b:c = 7:11, then a:b:c = ?

A. 2:7:12

B. 3:7:11

C. 6:14:22

D. 3:8:11

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 3:7, b:c = 7:11 ⇒ a:b:c = 3:7:11.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 8:3 and b:c = 3:6, then a:b:c = ?

A. 16:6:12

B. 8:3:6

C. 8:4:6

D. 7:3:7

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 8:3, b:c = 3:6 ⇒ a:b:c = 8:3:6.

This question belongs to: Maths Ratio and Proportion

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