algebra
posted by Socorro .
Sandy’s Sweatshirt Shop sells
college sweatshirts. White
sweatshirts sell for $18.95 each
and red ones sell for $19.50
each. If receipts for the sale of
30 sweatshirts total $572.90,
how many of each color did the
shop sell?

You can set up a system of equations. Let's make x = white sweatshirts and y = red ones. 18.95x + 19.50y = 572.90 and x + y = 30
Use elimination and go from there.