单选题 How many cubic centimeters of a solution that contains 15 grams of glucose per 100 cubic centimeters must be added to 45 cubic centimeters of a solution that contains 25 grams of glucose per 100 cubic centimeters so that the resulting solution is 18 grams of glucose per 100 cubic centimeters?

A、 20
B、 50
C、 60
D、 40
E、 105

【正确答案】 E

【答案解析】设需要n立方厘米这样的solution，那么0.15n+0.25×45=0.18(n+45)，于是得到n=105。正确答案为E。