If a:b = 3:8 and b:c = 8:10, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 3:8 and b:c = 8:10, then a:b:c = ?

A. 6:16:20

B. 3:8:10

C. 2:8:11

D. 3:9:10

Answer: Option B

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 3:8, b:c = 8:10 ⇒ a:b:c = 3:8:10.

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 3:5. After 6 years, the ratio becomes 4:7. Present age of A is?

A. 58 years

B. 63 years

C. 68 years

D. 126 years

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Correct Answer: Option B

Explanation:
Let ages 3k and 5k. Then (3k + 6)/(5k + 6) = 4/7. Solving gives k ≈ 21, age of A = 3*21 = 63.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 5:3 and b:c = 3:5, then a:b:c = ?

A. 5:3:5

B. 10:6:10

C. 4:3:6

D. 5:4:5

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 5:3, b:c = 3:5 ⇒ a:b:c = 5:3:5.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 8:7 and b:c = 7:4, then a:b:c = ?

A. 8:8:4

B. 8:7:4

C. 7:7:5

D. 16:14:8

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Correct Answer: Option B

Explanation:
Combine ratios: a:b = 8:7, b:c = 7:4 ⇒ a:b:c = 8:7:4.

This question belongs to: Maths Ratio and Proportion

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