6. $600 \mathrm{~kg}$ of mushrooms with a moisture content of $98 \%$ were harvested. After drying, the moisture content was reduced to $96 \%$. What is the mass of the mushrooms after drying?
6. U $600 \mathrm{~kg}$ of mushrooms with a moisture content of $98 \%$ has $588 \mathrm{~kg}$ of water and $12 \mathrm{~kg}$ of dry matter. 2 POINTS

After drying, the $12 \mathrm{~kg}$ of dry matter represents 4\% of the total mass of the mushrooms. 3 POINTS

Let $x$ be the mass of the mushrooms after drying.

Then we have

2 POINTS

$$
\begin{gathered}
4 \%(x)=12 \\
$$