If a:b = 6:10 and b:c = 10:4, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 6:10 and b:c = 10:4, then a:b:c = ?

A. 6:10:4

B. 5:10:5

C. 12:20:8

D. 6:11:4

Answer: Option A

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 6:10, b:c = 10:4 ⇒ a:b:c = 6:10:4.

This question belongs to: Maths Ratio and Proportion

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Question #1

If a:b = 6:7 and b:c = 7:12, then a:b:c = ?

A. 6:8:12

B. 12:14:24

C. 5:7:13

D. 6:7:12

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Correct Answer: Option D

Explanation:
Combine ratios: a:b = 6:7, b:c = 7:12 ⇒ a:b:c = 6:7:12.

This question belongs to: Maths Ratio and Proportion

Question #2

Ratio of present ages of A and B is 7:5. After 9 years, the ratio becomes 9:6. Present age of A is?

A. 112 years

B. 224 years

C. 117 years

D. 109 years

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Correct Answer: Option A

Explanation:
Let ages 7k and 5k. Then (7k + 9)/(5k + 9) = 9/6. Solving gives k ≈ 16, age of A = 7*16 = 112.

This question belongs to: Maths Ratio and Proportion

Question #3

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

A. 7:3:7

B. 16:6:12

C. 8:3:6

D. 8:4:6

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Correct Answer: Option C

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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