1Corina =c si Diana=d
c+d=67:c=d+13; d+13+d=67; 2d+13=67; 2d=67-13; 2d=54; d=54/2; d=27;
c+27=67; c=67-27; c=40
R----- Corina a sadit 40 panselute
------ Diana a sadit 27 panselute
2.m+d=78
m= d-16; m=..., d=...
d-16+d=78; 2d=78+16; 2d=94;d=94/2; d=47
m+d=78; m+47=78; m=78-47; m=31
R-------Dan are 47 abtibilduri
-------Mihai are 31 abtibilduri