On Sunday, a local hamburger shop sold a combined of 572 hamburger and cheeseburger. The number of cheeseburgers sold was three times the number of hamburger sold. How many hamburger were sold on Sunday

Answer: 143 hamburgers and 429 cheese burgers

Explanation:

Call h and c the number of both items.

(h-hamburger and c-cheeseburger)

h + c = 572

c = 3h

Sub the second into the first

h + 3h = 572

4h = 572

Divide both sides by 4

h = 143 hamburgers

Use this back into the second equation

c = 3 • 143 = 429 cheeseburgers