A total of 720 ppl attended the school basketball game. Adult tickets cost $2.50 each and student ticket costs $1.50 each. If $1220 worth of tickets were sold, how many students and how many adults attended?

X=number of adults.

y=number of students.

We can suggest the following system of equations:

x+y=720

2.5x+1.5y=1220

We can solve this system of equations by substitution method.

x+y=720 ⇒ y=720-x

2.5x+1.5 (720-x) = 1220

2.5x+1080-1.5x=1220

x=1220-1080

x=140

we solve the other unknown;

y=720-x

y=720-140

y=580

Answer: there was 140 adults and 580 students.