Nadia is learning to play the piano. She normally makes 3 mistakes per 40 notes and can play about 60 notes a minute.   If she plays for 8 minutes how many mistakes will she make on average?
She plays 480 notes because 8 x 60 = <<8*60=480>>480
This is 12 blocks of 40 notes because 480/40=<<480/40=12>>12
She makes 36 mistakes because 12 x 3 = <<12*3=36>>36
#### 36