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2014-05-14T22:27:34+03:00
A+b+c=111
a=b+c/2
(b+c)/2 + b +c=111
3b+3c=222
b+c=74
2014-05-14T22:31:51+03:00
A+b+c=111 
a=(b+c) :2 -> b+c=2a -> (b+c)/2 + b+c =111 -> 3b +3c =222 -> b+c=222/3=74
-> a=27