Răspuns :
a+(a+2)+(a+4)=a+70
a+a+a-a=70-6
2a=70-6
a=32
b=a+2=34
c=a+4=36
proba:
32+34+36=102
suma=102=a+70
a=102-70=32
a+a+a-a=70-6
2a=70-6
a=32
b=a+2=34
c=a+4=36
proba:
32+34+36=102
suma=102=a+70
a=102-70=32