There are 50 equally sized regular apartments in a housing estate and one which is half the size of regular apartment, each apartment is occupied by 4 tenants depending on the size, hence the half sized apartment will have only two occupants. 50 1/2 × 4/1 = 202

50 refers to the number of regular sized apartment ; 1/2 means the apartment after 59 is half the size of the regular ones.

4 refers to the number of occupants in each apartment depending on size.