6. Dried mushrooms. The moisture content of fresh mushrooms is $99\%$, and that of dried mushrooms is $98\%$. How has the weight of the mushrooms changed after drying?
6. Let the weight of fresh mushrooms be $100 x$ kg, then the weight of the dry matter in them is $x$ kg. After drying, the weight of the dry matter did not change and became $2 \%$ (one fiftieth) of the weight of the mushrooms. The weight of the dried mushrooms is $50 x$ kg, which means it has decreased by half.