SOLUTION: The schools store has t-shirts and sweat shirts for sale. they sold a total of 45 t-shirts and sweatshirts combined for a total of $700. If t-shirts cost $12 and sweatshirts cost $

Question 904566: The schools store has t-shirts and sweat shirts for sale. they sold a total of 45 t-shirts and sweatshirts combined for a total of $700. If t-shirts cost $12 and sweatshirts cost $20, how many of each did they sell?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
a+b=45,
12*a+20*b=700
a=45-b
12*(45-b)+20*b=700
540-12b+20*b=700
8*b=160
b=20
a=45-b
a=25 at $12 and b=20 at $20
check
25+20=45
12*a+20*b=700
12*25+20*20=700
300+400=700
700=700
ok

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