how many were sold ?? help please!

Question

One day a store sold 18 sweatshirts. white ones cost $11.95 and yellow ones cost $12.50. In all, $222.25 worth of sweatshirts were sold. How many of each color were sold ? 

 

how many white ? 

 

how many yellow ? 

Answer 1

Ok. So let's call the number of white shirts sold = X

and the number of yellow ones sold =(18-X)

So then we write the equation:

11.95X + 12.50(18-X) = 222.25

11.95X + 225 -12.50X = 222.25

2.75 = .55X

X = 5

So 5 white shirts and (18-5) = 13 yellow shirts

 

Check your answer:

11.95x5 + 12.50x13  = 222.25