Question

a local hamburger shop sold a combined total of 524 hamburgers and cheeseburgers. The number of cheeseburger sold were 3 times as much as the hamburgers. How many hamburgers were sold

Answer 1

393 for cheeseburgers and 131 hamburgers :)
as 131X3=393

Answer 2

x=number of hamburgers sold
y=number of cheeseburgers sold

Set up a system of equations:
x+y=524
y=3x

Solve by plugging in 3x for y in the first equation:
x+3x=524
4x=524
x=524/4
x=131

The number of hamburgers sold is 131 and the number of cheeseburgers sold is 393.