SOLUTION: A group of friends decides to meet for pizza, and one person calls ahead to order the pies. However, three of the group do not show up at the pizza parlor. The friends who do show

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Question 821329: A group of friends decides to meet for pizza, and one person calls ahead to order the pies. However, three of the group do not show up at the pizza parlor. The friends who do show up figure that if each adds $3 to their original share, they could cover the bill, which totals $70. How many friends eat pizza?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
let p = persons c=cost per person
p*c=70,
(p-3)*(c+3)=70
p=10 c=7