SOLUTION: (Can someone please help with this question?) One day a store sold 30 sweatshirts. White ones cost $9.95 and yellow ones cost $13.50. In all $337.55 worth of sweatshirts were sold

Algebra ->  Complex Numbers Imaginary Numbers Solvers and Lesson -> SOLUTION: (Can someone please help with this question?) One day a store sold 30 sweatshirts. White ones cost $9.95 and yellow ones cost $13.50. In all $337.55 worth of sweatshirts were sold      Log On


   

Question 843329: (Can someone please help with this question?)
One day a store sold 30 sweatshirts. White ones cost $9.95 and yellow ones cost $13.50. In all $337.55 worth of sweatshirts were sold. How many of each color were sold?
How many white sweatshirts were sold___?
How many yellow sweatshirts were sold___?
Answer by KMST(5328) About Me  (Show Source):
You can put this solution on YOUR website!
w= number of white shirts sold
y= number of yellow shirts sold

w%2By=30 because the store sold 30 sweatshirts.
w%2By=30 <---> y=30-w

9.95w%2B13.5y=337.55 or 9.95w%2B13.5%2830-w%29=337.55
because $337.55 worth of sweatshirts were sold.

9.95w%2B13.5%2830-w%29=337.55
9.95w%2B13.5%2A30-13.5w=337.55
%289.95-13.5%29w%2B13.5%2A30=337.55
-3.55w%2B405=337.55
-3.55w=337.55-405
-3.55w=-67.45
w=%28-67.45%29%2F%28-3.55%29
highlight%28w=19%29
Going back to y=30-w
and substituting w=19 we get
y=30-19
highlight%28y=11%29