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?
Answer
2⁄3 of an egg.
If 1.5 hens lay 1.5 eggs in 1.5 days, it must be that one hen would lay one egg in the same time period: 1.5 days. Now, if one hen lays one egg in 1.5 days, it means that one hen would lay only 2⁄3 of an egg in one day.