In a class 2/5’s of the students wear glasses. If 12 students wear glasses, how many students in the class do not wear glasses?

Answer 1

n = of the students

2 / 5 of the students wear glasses, 12 students wear glasses means:

2 / 5 n = 12

Multiply both sides by 5

2 n = 60

n = 30

30 - 12 = 18

18 students in the class do not wear glasses.

Answer 2

n = total numbers of the students