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December 20, 2014

December 20, 2014

Posted by **chris** on Thursday, January 28, 2010 at 11:33pm.

- math -
**Reiny**, Thursday, January 28, 2010 at 11:42pmlet the number of people in the original group be n

then the cost/person = 40/n

new group = n+3

cost per person in new group = 40/n - 3

but (40/n - 3)(n + 3) = 40

expanding, multiplying each term by n and simplifying gave me

n^2 + 3n - 40 = 0

(n+8)(n-3) = 0

n = -8 or n = 5

(can't have negative number of people, so

n = 5

there were 5 people in the original group and each paid $8

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