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The student council sold 661 T-shirts, some at $10 and some at $12. When recording the number of T-shirts they had sold at each of the two prices, they reversed the amounts. They thought they made $378 more than they really did. How many T-shirts actually were sold at $10 per shirt?

 Dec 14, 2018
 #1
avatar+17184 
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x = 10 dollar shirts

661 - x = 12 dollar shirts

 

10x + 12 (661-x)  + 378 = 12x + 10(661-x)

10x +7932 - 12x + 378 = 12x +6610 -10x

 

x = 425    shirts @ $10

 Dec 14, 2018
 #2
avatar+98034 
0

Very nice, EP!!!

 

 

cool cool cool

CPhill  Dec 15, 2018

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