At a school fundraiser, Annie purchases some t-shirts as prizes. The medium sized shirts were $4 per shirt and the large were $5 per shirt. If she ordered a total of 70 shirts with a total cost of $320, how many t – shirts were size medium?
"m+l=70;\\;4m+5l=320."
"l=70-m."
"4m+5(70-m)=320."
"4m-5m=320-350."
"m=30."
30 t – shirts were size medium.
Comments
Leave a comment