Total number of people living in an apartment = 18 + 36 = 54
18 people living in an apartment have a pet.
So percentage of people living in an apartment who have a pet =

%
Total number of people living in a house = 43 + 24 = 67
43 people living in a house have a pet.
So percentage of people living in a house who have a pet =

%
So answer in first blank is 33% and answer in second blank is 64%.