## Elementary Algebra

A guideline for this problem would be: Current number of students = Last year number of students + Amount increase in the number of students. Let x represent the number of students that received reduced lunch prices last year. So: 253 = x + 15% $\times$ x 253 = x + 0.15x 253 = 1.15x Divide both sides by 1.15 220 = x 220 students received reduced lunch prices last year.