A Chicken and Egg Situation

Assuming all hens behave similarly and that egg laying proceeds in a linear way, we can state that 1.5 hens lay 1.5 eggs in 1.5 days. Four times the number of hens will lay four times the number of eggs in the same time interval, i.e. six hens lay six eggs in 1.5 days.

In a time interval that is four times longer, the same number of hens will produce four times the number of eggs, so six hens will lay 24 (two dozen) eggs in six days.