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2014-11-10T11:16:55+02:00
(a+b+c)/3=31
(a+b)/2=21
(b+c)/2=40
  

a+b=21*2=42
a+b+c=31*3=93
42+c=93
c=93-42=51

b+c=40*2
b=80-51=29
a=42-b=42-29=13