there are two kinds of sweet water A and B .a contains 270 grams of sugar and 30 grams water .B contains 400 grams of su
问题描述：
there are two kinds of sweet water A and B .a contains 270 grams of sugar and 30 grams water .B contains 400 grams of sugar and 100 grams of water.now i want to get 100 grams sweet water which is 82.5% concentrated .what is the weight of A and B respectively do we need?
答
a：25g
b：75g能写出翻译和计算过程吗?快些哦？0.9a+0.8b=82.5%*100a+b=100翻译是：有两种糖水，a和b，a含有270g糖，30g水。b含有400g糖，100g水。求，要100g糖水中的含糖量是82.5%，则应各加多少a和b。