Task 1. 600 kg of mushrooms with a moisture content of $98 \%$ were collected. After drying, the moisture content was reduced to $96 \%$. What is the mass of the mushrooms after drying?
Solution. In 600 kg of mushrooms with a moisture content of $98\%$, there is 588 kg of water and 12 kg of dry matter. After drying, the 12 kg of dry matter represents $4\%$ of the total mass of the mushrooms. Let $x$ be the mass of the mushrooms after drying. Then $0.04 \cdot x=12$, from which $x=300$ kg.