现有浓度为20%的糖水350克,要把它变成浓度为30%的糖水,需加糖多少克?

2024-12-15 15:55:29
推荐回答(1个)
回答1:

350×(1-20%)÷(1-30%)-350,
=350×0.8÷0.7-350,
=280÷0.7-350,
=400-350,
=50(克);
答:需加糖50克.