A hen and a half lays an egg and a half in a day and a half. How many eggs does one hen lay in one day?
If 1.5 hens lay 1.5 eggs in 1.5 days, it means that one hen would lay one egg in the same time period: 1.5 days.
Then, if one hen lays one egg in 1.5 days, it means that one hen would lay only ⅔ of an egg in one day.
So the answer is ⅔ of an egg.