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

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

A. 5:6:4

B. 4:5:5

C. 10:10:8

D. 5:5:4

Answer: Option D

Solution (By JKSSB Mock Tests)

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

This question belongs to: Maths Ratio and Proportion

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Question #1

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Two numbers are in the ratio 15:6 and their sum is 521. Find the numbers.

A. 720 and 288

B. 360 and 144

C. 375 and 127

D. 347 and 158

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Correct Answer: Option B

Explanation:
Numbers = 15k and 6k. 15k + 6k = 521 ⇒ k = 24. Thus, numbers are 360 and 144.

This question belongs to: Maths Ratio and Proportion

Question #2

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Milk and water are in ratio 4:3 in a 173 L mixture. Quantity of milk?

A. 196 L

B. 98 L

C. 75 L

D. 140 L

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Correct Answer: Option B

Explanation:
Total parts = 7. Milk = [4 / (4+3)] × 173 = 98 L.

This question belongs to: Maths Ratio and Proportion

Question #3

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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. 252 years

B. 131 years

C. 126 years

D. 123 years

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Correct Answer: Option C

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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