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2014-09-28T17:15:45+03:00
A + b + c =52
a= 10
c-b = 12 => c = b + 12
10+ b + b + 12= 52
10+ 2b+ 12= 52
10+ 2b= 40
2b= 30 => b= 15
c= 15+ 12= 27
1 5 1
2014-09-28T17:19:39+03:00
A+b+c=52
a=10
b+c=52-10=42
b-c=12
 b [_______] +12  suma 42
 [_______]       
    42-12=30
c=30:2
c=15
b=15+12
b= 27