Investors & landlords

So in rough square foot the two bedrooms and bathroom are around 20% of the total square feet.  So I put that in. 

 

On the utilities front I want to divide it by the number of roommates as the amounts go up and down with a 3rd or 4th person.  Can I report the expenses that way, as Turbotax is only giving me 20% of the number when I put it in.