Divide the 18 apples into 6 portions on average, one portion is a fraction of the total number, five portions are a fraction of the total number, and how many are there?

Divide the 18 apples into 6 portions on average, one portion is a fraction of the total number, five portions are a fraction of the total number, and how many are there?

18÷6=3
3÷18=¹/6
¹/6×5= 5/6
18×5/6=15
15÷18=5/6