Unit rate
Since 31 hens laid 93 eggs, then we know that 93 eggs per 31 hens are, that is represented by the fraction
93 eggs / 31 hens
in order to find the unit rate for eggs per hen we just divide those quatities
Since 93/31 = 3 then
93 eggs / 31 hens = 3 eggs / hen
Answer: the unit rate is 3 eggs per hen