Water container

The cube-shaped container is filled to two-thirds of its height. If we pour 18 liters, it will be filled to three-fifths of the height. What is the volume of the whole container?

Correct result:

V =  270 l

Solution:

$$\begin{gathered} V=a^3=a^{2}v \\ 2\mathrm{/}3\cdot V-18=3\mathrm{/}5\cdot V \\ V=270=270\text{ l} \end{gathered}$$

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