If a:b = 5:8 and b:c = 8:6, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 5:8 and b:c = 8:6, then a:b:c = ?

A. 4:8:7

B. 10:16:12

C. 5:9:6

D. 5:8:6

Answer: Option D

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 5:8, b:c = 8:6 ⇒ a:b:c = 5:8:6.

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 30 and 37.

A. 36

B. 66

C. 33

D. 67

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Correct Answer: Option C

Explanation:
Mean proportional = √(30 × 37) = √(1110) = 33.

This question belongs to: Maths Ratio and Proportion

Question #2

Ratio of present ages of A and B is 7:8. After 11 years, the ratio becomes 10:10. Present age of A is?

A. 161 years

B. 322 years

C. 166 years

D. 156 years

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Correct Answer: Option A

Explanation:
Let ages 7k and 8k. Then (7k + 11)/(8k + 11) = 10/10. Solving gives k ≈ 23, age of A = 7*23 = 161.

This question belongs to: Maths Ratio and Proportion

Question #3

If a:b = 6:9 and b:c = 9:10, then a:b:c = ?

A. 6:10:10

B. 12:18:20

C. 6:9:10

D. 5:9:11

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 6:9, b:c = 9:10 ⇒ a:b:c = 6:9:10.

This question belongs to: Maths Ratio and Proportion

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