There are 390 students at Walker Elementary this year. This is a 30% increase from the previous year. How many students were at Walker Elementary last year?

There were 300 students

Step-by-step explanation:

Original * 30 = increase

Add the increase to get the new number

original + increase = 308

original + original*30% = 390

Factor out original number

original (1+30%) = 390

Change to decimal form

original (1+.30) = 390

original (1.30) = 390

Divide by 1.3

original = 390/1.3

=300