I+T=559
T+A=600
I+A=531
I,T,A=?
calculam toate relatiile
I+T=559
T+A=600
I+A=531
------------
2xI+2xT+2xA=1.690 scoatem factorul comun
2x(I+A+T)=1.690
(I+T+A)=1.690:2
I+T+A=845 inlocuim suma numerelor I+T
559+A=845
A=845-559
A=286 puncte are Andrei
T+A=600
T+286=600
T=600-286
T=314 puncte are Teodor
I+A=531
I+286=531
I=531-286
I=245 puncte are Irina