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A container contains 40 litres of milk. From this container 4 litres of milk was taken out and replaced by water. This process was repeated further two times. How much milk is now contained by the container?

Correct Answer: 29.16 litres
$$\eqalign{ & {\text{Amount}}\,{\text{of}}\,{\text{milk}}\,{\text{left}}\,{\text{after}}\,{\text{3}}\,{\text{operations}} \cr & = \left\,{\text{litres}} \cr & = \left( {40 \times \frac{9}{{10}} \times \frac{9}{{10}} \times \frac{9}{{10}}} \right)\,{\text{litres}} \cr & = 29.16\,{\text{litres}} \cr} $$

A container contains 40 litres of milk.From this container 4 litres of milk was taken out and replaced by water. This process was repeated further two times. How much milk is now contained by the container.

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