Question

On Friday, a local hamburger shop sold a combined total of hamburgers and cheeseburgers. The number of cheeseburgers sold was two times the number of hamburgers sold. How many hamburgers were sold on Friday?

Answer 1

Total=#hamburgers+#cheeseburgers
#cheeseburgers=2*#hamburgers

Rearranging second formula
#hamburgers=#cheeseburgers/2

Substituting second into first
Total=#hamburgers+2*#hamburgers
Then rearranging
Total=3*#hamburgers and #hamburgers=Total/3

That's about all you can say.