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A group of friends is out at a restaurant. Just before the bill comes, two of them climb out the bathroom window to avoid paying their share. The bill comes, and it's $63. One of the other friends says, "Those guys stiffed us-again! But look. If everyone throws in an extra two bucks, we'll cover the bill." 
The question is how many people were in the original group? 

 Feb 3, 2022
 #1
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Let the original number of friends==F
Let the share of each friend ==S


F * S ==63,  
[F - 2]*S + [F - 2] * 2==63, solve for F, S


Use the quadratic formula to get:


F ==9 - original number of friends
S==$7 - original share of each friend.

 Feb 3, 2022

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