Răspuns :

{90+[100+(11*4+7*8):10]-80}:60=

{90+[100+(44+56):10]-80}:60=

{90+[100+100:10]-80}:60=

{90+[100+10}-80}:60=

{90+110}-80}:60=

{200-80}:60=

120:60=2