a+b+c=918
a=b +118
c=b -100
inlocuiesti a, si c :
a c
(b+118)+b+(b-100)=918
acum aduni b, si apoi cifrele:
3b+18 = 918
3b= 918-18
3b = 900
b= 900:3
b= 300
Acum vedem ca:
a=b +118
deci a= 300+118; a= 418
c=b -100
c= 300-100; c= 200
Deci am aflat
a=418
b=300
c=200
_________
Total=918