Răspuns :
120'=2grade
180'=3grade
360'=6grade
420'=7grade
660'=11grade
900'=15grade
1260'=21grade
4200'=70grade
180'=3grade
360'=6grade
420'=7grade
660'=11grade
900'=15grade
1260'=21grade
4200'=70grade