72:8=9 mandarine in fiecare cos
9-5=4 mandarine (cate 4 mandarine raman in cosurile 3;4;5)
9+5=14 mandarine (cate 14 mandarine sunt in cosurile 6;7 si 8)
14*3=42 mandarine sunt in ultimele 3 cosuri
(9+9)+(4*3)+(14*3)=
=18+12+42
=30+42
=72 mandarine in total
