搜搜考试网求解一道关于浓度的英语奥数题
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求解一道关于浓度的英语奥数题
There are two cups of salt water——A and B.Each cup is 40 grams,and the proportion of the concentration is 3:2.Add 60 grams of water in B,then pour _____ grams of the liquid into A.Then add water in both A and B until each cup is 100 grams,and the proportion of concentration is 7:3.
There are two cups of salt water——A and B.Each cup is 40 grams,and the proportion of the concentration is 3:2.Add 60 grams of water in B,then pour _____ grams of the liquid into A.Then add water in both A and B until each cup is 100 grams,and the proportion of concentration is 7:3.
翻译：有两个杯子的盐水- A和B.每杯是40克,盐的比例和浓度是3:2.往B里增加60克的水,再把B里的盐水往A中倒__25___克,再往A、B中加入水,直到每杯A和B是100克、盐的比例是7:3
设B中有盐x克.
x/2*3=1.5x(克)
(1.5+1）x/(7+3)*7=1.75x(克)
(1.75-1.5)x/(x/100)=25(克)
设B中有盐x克.
x/2*3=1.5x(克)
(1.5+1）x/(7+3)*7=1.75x(克)
(1.75-1.5)x/(x/100)=25(克)