raspunsul corect este 11 taieturi
cand facem o taietura obtinem 2 bucati |....| taiata->|...|...|
cand facem 2 taieturi obtinem 3 bucati. |....| taiata de 2 ori -> |...|....|...|
...........................................................................
cand facem n taieturi obtinem n+1 bucati ( si n+2 frontiere)
60:5=12 bucati
n+1=12
deci taieturi
n= 12-1=11