How many liters of water should be added to a \(30\) liters mixture of milk and water containing milk and water in the ratio \(7:3\) such that the resultant mixture has 40% water in it?
Question and options
How many liters of water should be added to a liters mixture of milk and water containing milk and water in the ratio such that the resultant mixture has 40% water in it?
- 5
- 2
- 3
- 8
Answer and explanation
Correct answer: A - 5
Milk = 21 L, water = 9 L. Milk must be 60% of the new mixture: 21/0.6 = 35 L total, so add 35 - 30 = 5 L of water.
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