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a+b+c=80, a+b=45 ,b+c=50 ,a+b+c=?

Răspuns :

c=80-45
c=35
b=50-35
b=15
a=45-15
a=30
Verificare
35+15+30=80

Sper ca te-am ajutat
c+45=80
c=80-45=35
a+50=80 
a=80-50=30
b=80-30-35
b=15
a+b+c=35+30+15=80