Mr Wee bought t-shirts at $5 each and sold them at $9each. Those who bought 2 t-shirts from him were given one t-shirt free. At the end of the sale, Mr Wee made a total of $1288 and 120 t-shirts were given free. How many customers bought only 1 t-shirt?

Answer 1

If x bought 2 shirts and y bought only 1, then

x = 120
9(2x+y) = 5(2x+y+120) + 1288

y = 232