If one and a half hens lay one and a half eggs in one and a half days, how many eggs does one hen lay in one day?

This is a rate problem. If 1.5 hens lay 1.5 eggs in 1.5 days, then 1 hen lays 1.5 eggs in 1.5 days (dividing everything by 1.5). So in 1 day, 1 hen lays (1.5/1.5) = 1 egg per day from the 1.5-day rate. The correct answer is 2/3 eggs because: the rate is 1 egg per 1.5 days, so per day it's 1/1.5 = 2/3 eggs. The key is understanding proportional relationships and reducing the complex rate to a simpler form.