Răspuns :
|___| stilouri
|___|___| penare } 630
1s + 2s = 630
3s = 630
s = 630 : 3
s = 210 stilouri
2s = 420 penare
|___|___| penare } 630
1s + 2s = 630
3s = 630
s = 630 : 3
s = 210 stilouri
2s = 420 penare