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

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

A. 5:6:8

B. 10:10:16

C. 5:5:8

D. 4:5:9

Answer: Option C

Solution (By JKSSB Mock Tests)

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

This question belongs to: Maths Ratio and Proportion

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Question #1

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

A. 306

B. 153

C. 345

D. 389

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Correct Answer: Option A

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

This question belongs to: Maths Ratio and Proportion

Question #2

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Milk and water are in ratio 6:6 in a 413 L mixture. Quantity of milk?

A. 412 L

B. 245 L

C. 207 L

D. 206 L

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Correct Answer: Option D

Explanation:
Total parts = 12. Milk = [6 / (6+6)] × 413 = 206 L.

This question belongs to: Maths Ratio and Proportion

Question #3

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

A. 39 years

B. 50 years

C. 45 years

D. 90 years

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Correct Answer: Option C

Explanation:
Let ages 5k and 5k. Then (5k + 5)/(5k + 5) = 6/7. Solving gives k ≈ 9, age of A = 5*9 = 45.

This question belongs to: Maths Ratio and Proportion

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