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2014-01-13T22:21:03+02:00
A+b+c=91
a/b=4
a/c=2
 b=a/4
c=a/2
a+a/4+a/2=91
4a+a+2a=91*4
7a= 364
a=364/7=52
b=52/4=13
c= 52/2= 26