Question

At a concert $720.00 was collected for hotdogs hamburgers and soft drinks.all three coct $1.00 each. Twice as many hotdogs were sold as hamburgers. Three times as many soft drinks were sold as hamburgers.the number of soft drinks sold was?

Answer 1

s = # of soft drinks
b = # of burgers
d = # of dogs

`s + b + d = 720 \\ 2d = b \\ 3s = b \\ \\ 2d/2 = 3s/2 \\ d = (3)/(2)s \\ \\ s + 3s + (3)/(2) s = 720 \\ 5.5s = 720 \\ 5.5s/5.5 = 720/5.5 \\ s = 130`
130 soft drinks were sold that night.
Hope this helps!