Correct Answer: 5 litres
Explanation:
Given:
Step 1: Find quantity of milk and water in the original mixture
Total parts = 4 + 1 = 5
Milk = (4/5) × 75 = 60 litres
Water = (1/5) × 75 = 15 litres
Step 2: Let x litres of water be added
New water = 15 + x
Milk remains the same = 60 litres
Required ratio: Milk : Water = 3 : 1
⇒ 60 / (15 + x) = 3 / 1
⇒ 60 = 3(15 + x)
⇒ 60 = 45 + 3x
⇒ 15 = 3x
⇒ x = 5
Answer: 5 litres of water should be added.
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