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求一道GMAT数学题Ofthe32studentsinacertainclass,15areinamusiccluband20areinadanceclub.If10ofthestudentsarenotineitherclub,howmanyofthestudentsareinonlyoneofthetwoclubs?

题目详情
求一道GMAT数学题
Of the 32 students in a certain class,15 are in a music club and 20 are in a dance club.If 10 of the students are not in either club,how many of the students are in only one of the two clubs?
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答案和解析
同时参加唱歌和跳舞的:15+20+10-32=13
所以只参加一个的15+20-13*2=9