Apple juice

From 7 kg of apples we get 3 liters of apple juice. How many liters of juice do we get from 42 kg of apples?

Correct result:

V₂ =  18 l

Solution:

$$\begin{gathered} m_1=7\text{ kg } \\ {m}_2=42\text{ kg } \\ {V}_1=3\text{ l } \\ {m}_1:V_1=m_2:V_2 \\ {V}_2={\displaystyle \frac{m_2}{m_1}}\cdot V_1={\displaystyle \frac{42}{7}}\cdot 3=18\text{ l} \end{gathered}$$

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