<human>:  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?
<bot>: How many apartments does he need keys for? ** There are 2*12=<<2*12=24>>24 apartments he needs keys for
How many keys does he need to make? ** So he needs 24*3=<<24*3=72>>72 keys
#### 72