Appreciate help with the following problem:
At a concert 500 tickets were sold. Cheap tickets cost £5, expensive tickets cost £9.
If the total receipts were £3220, how many cheap tickets were sold.
TIA
let the number of cheap tickets be c
let the number of expensive tickets be e
we have
c + e = 500 .......................(1)
5c + 9e = 3220 ...................(2)
if you don't understand how i got these equations tell me
9c + 9e = 4500 ................(3) = (1)*9
5c + 9e = 3220 ................(2)
=> 4c = 1280 .................(3) - (2)
=> c = 1280/4 = 320
320 cheap tickets were sold