3.33 From milk with a fat content of $5 \%$, cottage cheese with a fat content of $15.5 \%$ is produced, leaving behind whey with a fat content of $0.5 \%$. How much cottage cheese is obtained from 1 ton of milk?

## Geometric and Physical Problems
3.33 Let $x$ tons of cottage cheese with a fat content of $15.5\%$ be obtained; then $1-x$ tons of whey with a fat content of $0.5\%$ will remain. Therefore, in 1 ton of milk, there is

$\frac{15.5 x}{100}+\frac{0.5(1-x)}{100}=\frac{15.5 x+0.5}{100}$ tons of fat.

According to the condition, $\frac{15.5 x+0.5}{100}=\frac{5}{100}$, from which $x=0.3$ (tons).

Answer: $\quad 300 \text{kg}$.