Given the 100 students in the Springdale High School senior class,38 students are taking math,45 students are taking psy
问题描述：
Given the 100 students in the Springdale High School senior class,38 students are taking math,45 students are taking psychology,and 12 students are taking both classes.How many students in the senior class are taking exactly one of the two classes?
答
38-12+45-12=59