Tim owns rental properties.  He decides to replace all the locks and needs to get 3 keys per lock.  He owns two apartment complexes which each have 12 apartments.  How many keys does he need to make?
Tim owns rental properties. He decides to replace all the locks and needs to get [NUMBER] keys per lock. He owns two apartment complexes which each have [NUMBER] apartments. How many keys does he need to make?
There are 2*12=<<2*12=24>>24 apartments he needs keys for
So he needs 24*3=<<24*3=72>>72 keys
#### 72