4t......................5s..........................16720 lei
2t......................5s..........................10320 lei
---------------------------------------------------------------
2t=6400
t=6400:2
t=3200 lei un tablou
4x3200+5s=16720
12800+5s=16720
5s=16720-12800
5s=3920
s=784 lei o sculptura
proba:
4x3200+5x784=12800+3920=16720