If a:b = 6:10 and b:c = 10:6, then a:b:c = ? MCQ with Answer and Explanation

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

A. 6:11:6

B. 12:20:12

C. 6:10:6

D. 5:10:7

Answer: Option C

Solution (By JKSSB Mock Tests)

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

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 11 and 61.

A. 72

B. 28

C. 25

D. 50

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Correct Answer: Option C

Explanation:
Mean proportional = √(11 × 61) = √(671) = 25.

This question belongs to: Maths Ratio and Proportion

Question #2

Milk and water are in ratio 6:4 in a 289 L mixture. Quantity of milk?

A. 116 L

B. 223 L

C. 346 L

D. 173 L

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Correct Answer: Option D

Explanation:
Total parts = 10. Milk = [6 / (6+4)] × 289 = 173 L.

This question belongs to: Maths Ratio and Proportion

Question #3

Ratio of present ages of A and B is 7:5. After 7 years, the ratio becomes 10:8. Present age of A is?

A. 131 years

B. 126 years

C. 123 years

D. 252 years

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Correct Answer: Option B

Explanation:
Let ages 7k and 5k. Then (7k + 7)/(5k + 7) = 10/8. Solving gives k ≈ 18, age of A = 7*18 = 126.

This question belongs to: Maths Ratio and Proportion

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