Question

A store sold 30 sweatshirts. White ones cost $10.95 and yellow ones cost $13.50. If $356.55 worth of sweatshirts were sold, how many of each were sold

Answer 1

The store sold 19 white shirts and 11 yellow shirts.
x+y=30
10.95x+13.5y=356.55
x=30-y
Substitute x
10.95(30-y)+13.5y=356.55
x=19
19+y=30
Subtract 19
y=11