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September 18, 2014

September 18, 2014

Posted by **Bob** on Wednesday, October 24, 2012 at 2:06pm.

- math 7 grade -
**Jennifer**, Wednesday, October 24, 2012 at 8:36pm1*ch1 + 9*ch2 + 81*ch3 = 200

with ch1+ch2+ch3 <= 8

where ch1 is the number of charities belonging to the first group, ch2 is the number of charities belonging to the second group, and ch3 is the number of charities belonging to the 3rd group

the number in charity 3 can only be 1 or 2; if the number is 1, then there has to be at least 13 charities in group 2; therefore this possibility is excluded.

ch3 = 2

If ch3=2, ch2 can be 1,2,3,or 4

If ch2 = 4, then ch1 = 2

and 4+2+2 = 8

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