Salt solution

Calculate the weight of a 50% salt solution that we prepare from 120 g of salt.

Correct answer:

m =  240 g

Step-by-step explanation:

$$\begin{gathered} m_1=120\text{ g } \\ r=50\mathrm{\%}={\displaystyle \frac{50}{100}}=0.5 \\ {m}_1:m=r \\ m=m_1\mathrm{/}r=120\mathrm{/}0.5=240\text{ g} \end{gathered}$$

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