I+T=559
T+A=600
I+A=531
-------------------------
I=?
T=?
A=?
I+T+A=559+600+531
=1159+531=
=1690
I+T+A=845
I+T =559
A=845-559
A=286
I+T+A=1690
T+A= 600
---------------------------
I=845-600
I=245
I+T+A=1690
I+T =531
T=1690-531
T=1159
V:1159+ 245+ 286=
1404+ 286=
1690
R: I=245
T=1159
A=286
Sper ca te-am ajutat! Succes la scoala! :)