If a hen and a half lays an egg and a half

If a hen and a half lays an egg and a half in a day and a half, how many eggs will five hens lay in 6 days?

5 hens would lay 5 eggs in a day and a half.
In 6 days, there are 4 day-and-a-half
5 x 4 = 20
(each hen lays 2/3 egg per day)