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2014-04-13T18:46:29+03:00
A+b+c/3=6
a+b+c=18
a+b+6=18
a+b=12
ma  =a+b/2=12/2=6
4 5 4
2014-04-13T18:46:46+03:00
(a+b+c) / 3 = 6 
c = 6 

=> a/3 + b/3 + 2 = 6 => (a+b) = 4*3 => (a+b)/2 = 6 
1 5 1