现在有浓度为20%的糖水60克,要把它变成浓度为40%的糖水,需要加糖多少克?
人气:482 ℃ 时间:2019-09-27 16:37:17
解答
60×(1-20%)÷(1-40%)-60
=60×0.8÷0.6-60
=48÷0.6-60
=80-60
=20(克)
答:需要加糖20克.
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