There are 500 children in elementary. Today 25 children are away. what percentage are present?

This can be solved using a proportion

100 : 500 = x : 475

100 percent is 500, x percent is based on the remaining 475 students

100 x 475 = 500x

47500 = 500x

x = 47500/500

x=95

95% of students are present.