Two hundred tickets for the school play were sold. Tickets cost $2 for students and $3 for adults. The total amount collected $490. How many student tickets were sold?

Answer 1

Solve these two simultaneous equations:
S + A = 200
2S + 3A = 490

Try subtracting
2S + 2A = 400 from the second equation.
(I doubled the first equation)

That will leave you with A = 90 adult tickets sold.

Now finish the problem.