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?
There are 2*12=
<gadget id="calculator">2*12</gadget>
<output>24</output>
24 apartments he needs keys for.
So he needs 24*3=
<gadget id="calculator">24*3</gadget>
<output>72</output>
72 keys.

<result>72</result>