Răspuns :
a+b+c=154
a=b+18
c=b+13
b+18+b+b+13=154
3b+31=154
3b=123
b=41
a=41+18=59
c=41+13=54
proba: 59+41+54=154
a=b+18
c=b+13
b+18+b+b+13=154
3b+31=154
3b=123
b=41
a=41+18=59
c=41+13=54
proba: 59+41+54=154