Empty barrel

In the backyard is an empty barrel with a volume of 2 hl. How many liters are missing at the edge, when 53 liters flowed into it for 1 day and 68 liters of water for 2 days?

Correct result:

V₃ =  79 l

Solution:

$$\begin{gathered} V=2\text{ hl}\to \text{ l}=2\cdot 100\text{ l}=200\text{ l } \\ {V}_1=53\text{ l } \\ {V}_2=68\text{ l } \\ {V}_3=V-V_1-V_2=200-53-68=79\text{ l} \end{gathered}$$

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