If a:b = 4:10 and b:c = 10:5, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 4:10 and b:c = 10:5, then a:b:c = ?

A. 8:20:10

B. 4:11:5

C. 4:10:5

D. 3:10:6

Answer: Option C

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 4:10, b:c = 10:5 ⇒ a:b:c = 4:10:5.

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 19 and 78.

A. 41

B. 97

C. 38

D. 76

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Correct Answer: Option C

Explanation:
Mean proportional = √(19 × 78) = √(1482) = 38.

This question belongs to: Maths Ratio and Proportion

Question #2

Ratio of present ages of A and B is 4:5. After 4 years, the ratio becomes 6:7. Present age of A is?

A. 60 years

B. 65 years

C. 120 years

D. 55 years

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Correct Answer: Option A

Explanation:
Let ages 4k and 5k. Then (4k + 4)/(5k + 4) = 6/7. Solving gives k ≈ 15, age of A = 4*15 = 60.

This question belongs to: Maths Ratio and Proportion

Question #3

If a:b = 2:3 and b:c = 3:10, then a:b:c = ?

A. 2:3:10

B. 2:4:10

C. 1:3:11

D. 4:6:20

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 2:3, b:c = 3:10 ⇒ a:b:c = 2:3:10.

This question belongs to: Maths Ratio and Proportion

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