A bag of feed is enough for 10 chickens because 20 / 2 = <<20/2=10>>10
Each chicken costs $.2 to raise because 2 / 10 = <<2/10=.2>>.2
Each chicken results in $1.3 of profit because 1.5 - .2 = <<1.5-.2=1.3>>1.3
He sells 50 chickens because 65 / 1.3 = <<65/1.3=50>>50
#### 50