Milk and water are in ratio 7:2 in a 578 L mixture. Quantity of milk? MCQ with Answer and Explanation

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Milk and water are in ratio 7:2 in a 578 L mixture. Quantity of milk?

A. 449 L

B. 129 L

C. 898 L

D. 473 L

Answer: Option A

Solution (By JKSSB Mock Tests)

Total parts = 9. Milk = [7 / (7+2)] × 578 = 449 L.

This question belongs to: Maths Ratio and Proportion

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Question #1

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Ratio of present ages of A and B is 7:8. After 10 years, the ratio becomes 9:10. Present age of A is?

A. 152 years

B. 143 years

C. 294 years

D. 147 years

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Correct Answer: Option D

Explanation:
Let ages 7k and 8k. Then (7k + 10)/(8k + 10) = 9/10. Solving gives k ≈ 21, age of A = 7*21 = 147.

This question belongs to: Maths Ratio and Proportion

Question #2

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If a:b = 8:5 and b:c = 5:6, then a:b:c = ?

A. 8:5:6

B. 7:5:7

C. 8:6:6

D. 16:10:12

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Correct Answer: Option A

Explanation:
Combine ratios: a:b = 8:5, b:c = 5:6 ⇒ a:b:c = 8:5:6.

This question belongs to: Maths Ratio and Proportion

Question #3

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If a:b = 7:5 and b:c = 5:5, then a:b:c = ?

A. 7:6:5

B. 6:5:6

C. 7:5:5

D. 14:10:10

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Correct Answer: Option C

Explanation:
Combine ratios: a:b = 7:5, b:c = 5:5 ⇒ a:b:c = 7:5:5.

This question belongs to: Maths Ratio and Proportion

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