If a:b = 6:4 and b:c = 4:5, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 6:4 and b:c = 4:5, then a:b:c = ?

A. 6:5:5

B. 5:4:6

C. 6:4:5

D. 12:8:10

Answer: Option C

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 6:4, b:c = 4:5 ⇒ a:b:c = 6:4:5.

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 22 and 51.

A. 66

B. 36

C. 73

D. 33

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Correct Answer: Option D

Explanation:
Mean proportional = √(22 × 51) = √(1122) = 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 8:9. Present age of A is?

A. 126 years

B. 119 years

C. 252 years

D. 131 years

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Correct Answer: Option A

Explanation:
Let ages 7k and 8k. Then (7k + 11)/(8k + 11) = 8/9. Solving gives k ≈ 18, age of A = 7*18 = 126.

This question belongs to: Maths Ratio and Proportion

Question #3

Ratio of present ages of A and B is 7:4. After 9 years, the ratio becomes 10:5. Present age of A is?

A. 336 years

B. 161 years

C. 173 years

D. 168 years

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Correct Answer: Option D

Explanation:
Let ages 7k and 4k. Then (7k + 9)/(4k + 9) = 10/5. Solving gives k ≈ 24, age of A = 7*24 = 168.

This question belongs to: Maths Ratio and Proportion

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