If a:b = 3:10 and b:c = 10:4, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 3:10 and b:c = 10:4, then a:b:c = ?

A. 2:10:5

B. 3:11:4

C. 6:20:8

D. 3:10:4

Answer: Option D

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 3:10, b:c = 10:4 ⇒ a:b:c = 3:10:4.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

Find the mean proportional between 23 and 54.

A. 77

B. 70

C. 38

D. 35

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Correct Answer: Option D

Explanation:
Mean proportional = √(23 × 54) = √(1242) = 35.

This question belongs to: Maths Ratio and Proportion

Question #2

Ratio of present ages of A and B is 4:7. After 11 years, the ratio becomes 5:8. Present age of A is?

A. 40 years

B. 36 years

C. 45 years

D. 80 years

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Correct Answer: Option A

Explanation:
Let ages 4k and 7k. Then (4k + 11)/(7k + 11) = 5/8. Solving gives k ≈ 10, age of A = 4*10 = 40.

This question belongs to: Maths Ratio and Proportion

Question #3

Find the mean proportional between 34 and 17.

A. 27

B. 48

C. 24

D. 51

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Correct Answer: Option C

Explanation:
Mean proportional = √(34 × 17) = √(578) = 24.

This question belongs to: Maths Ratio and Proportion

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