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September 18, 2014

September 18, 2014

Posted by **Oscar** on Tuesday, February 5, 2013 at 7:53pm.

- math -
**Reiny**, Tuesday, February 5, 2013 at 8:56pm(a+b)/2 = 6

a+b = 12

(a+b+c)/3 = 11

a+b+c = 33

12+c = 33

c = 21

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