Question

A local hamburger shop sold a combined total of 581 hamburgers and cheeseburgers on friday. there were 69 fewer cheeseburgers sold than hamburgers. how many hamburgers were sold on friday?

Answer 1

You need two equations:
h + c = 581
h - 69 = c
Substitute (h - 69) for c in the first equation:
h + (h - 69) = 581
Solve:
2*h = 581 + 69
2*h = 650
h = ?