


Mirror Apartments 
Zoë lives in Apartment 23.
 On the first floor, the apartment that is the mirror image of Apartment 4, Carl's apartment, is Apartment 7.
 On the second floor, the apartment directly above Apartment 7 is Apartment 15.
 On the third floor, the apartment directly above Apartment 15 is Apartment 23, Zoë's apartment.
 (Add 8 to each apartment number on the first floor to get the secondfloor apartment number directly above it, and then add another 8 to get the apartment number of the thirdfloor apartment.)

