Question : If 60 litres of a milk solution has 40% milk in it, then how much milk should be added to make the milk 60% in the solution?
Option 1: 30 litres
Option 2: 25 litres
Option 3: 20 litres
Option 4: 35 litres
Correct Answer: 30 litres
Solution : Given, 60 litres of milk solution has 40% milk in it. Quantity of milk = $60\times\frac{40}{100}$ ⇒ Quantity of milk = 24 litres ⇒ Quantity of water = 60 - 24 ⇒ Quantity of water = 36 litres According to the question, The new solution has 60% milk and 40% water. Now, If 40% of water = 36 litres Quantity of milk = $\frac{36}{40}\times 60$ = 54 litres So, Quantity of milk required = 54 – 24 = 30 litres Hence, the correct answer is 30 litres.
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