If a:b = 8:5 and b:c = 5:4, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 8:5 and b:c = 5:4, then a:b:c = ?

A. 8:5:4

B. 16:10:8

C. 7:5:5

D. 8:6:4

Answer: Option A

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 8:5, b:c = 5:4 ⇒ a:b:c = 8:5:4.

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 7 and 35.

A. 30

B. 42

C. 15

D. 18

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Correct Answer: Option C

Explanation:
Mean proportional = √(7 × 35) = √(245) = 15.

This question belongs to: Maths Ratio and Proportion

Question #2

Ratio of present ages of A and B is 4:8. After 6 years, the ratio becomes 7:11. Present age of A is?

A. 87 years

B. 92 years

C. 184 years

D. 97 years

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Correct Answer: Option B

Explanation:
Let ages 4k and 8k. Then (4k + 6)/(8k + 6) = 7/11. Solving gives k ≈ 23, age of A = 4*23 = 92.

This question belongs to: Maths Ratio and Proportion

Question #3

Two numbers are in ratio 7:11. Their difference is 125. What is their sum?

A. 153

B. 306

C. 389

D. 345

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Correct Answer: Option B

Explanation:
Numbers 7k, 11k. Difference |7-11|k = 125 ⇒ k = 31. Sum = (7+11)k ≈ 306.

This question belongs to: Maths Ratio and Proportion

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