380 = c + h
c = cheeseburgers
h = hamburgers
c = h - 70
380 = (h - 70) + h
So, fire we are going to add 70 to both sides.
450 = 2h
Divide by 2
225 = h
Hamburgers = 225
Cheese burgers = 225 - 70 = 155
380 = 155 + 225
There were 225 hamburgers sold on Wednesday.