SOLUTION: Annabelle's school was selling t-shirts and sweatshirts. The t-shirts sold for $10.00 and the sweatshirts sold for $15.00. The school sold $1000 worth of t-shirts and sweatshirts

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Question 194414: Annabelle's school was selling t-shirts and sweatshirts. The t-shirts sold for $10.00 and the sweatshirts sold for $15.00. The school sold $1000 worth of t-shirts and sweatshirts for a total of 80 sold. How many of each did they sell?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
10T+15S=1,000
T+S=80 OR T=80-S
10(80-S)+15S=1,000
800-10S+15S=1,000
5S=1,000-800
5S=200
S=200/5
S=40 SWEATS SOLD.
80-40=40 T'S SOLD.
PROOF
10*40+15*4-=1,000
400+600=1,000
1,000=1,000