A thief stole some litres of milk from a full container having 300 litres of milk and poured water to fill the container. The concentration of milk in the container was now 72%. Find the number of litres of milk he stole?

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Solution

The correct option is C 84
The amount water initially = 0%

Then milk is removed and pure water of 100% is added to get 28% (100% - 72%).

So, the allegation cross is
So, the ratio = $\frac{72 p e r c e n t}{28 p e r c e n t} = \frac{18}{7}$
Hence, the amount of milk stolen = amount of water added = $\frac{7}{18 + 7} \times 300 = 84 l i t r e s$ .

So, option (C) is the correct answer.

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