Превидите дроби 2/3, 1/2, 3/4, 1/6, 4/15, 7/20, 11/30 к знаминателю 60
2/3=40/60 1/2=30/60 3/4=45/60 1/6=10/60 4/15=16/60 7/20=21/60 11/30=22/60