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?
There are a total of 35 in the two clubs and 10 not in either. That makes 45 students, however there are only 32 in the class which means 45-32 = 13 students in BOTH clubs. So if we want to find how many are in only one club we can say 32 = 13 + 10 + x
