Correct Answer: 10
Explanation:
Step 1: Understand the initial setup
Step 2: Let x litres of milk be added
Step 3: Set up the equation
We want water to be 80% of the total mixture:
Water / (Milk + Water) = 80 / 100 => 72 / (80 + x) = 4 / 5
Step 4: Solve the equation
72 × 5 = 4 × (80 + x) 360 = 320 + 4x 360 - 320 = 4x 40 = 4x x = 10
Answer: 10 litres
You need to add 10 litres of milk to make water 80% of the new mixture.
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