The cafe has 16 chefs and 16 waiters. If 6 chefs and 3 waiters drop out, how many chefs and waiters are left?
There are 16 chefs - 6 chefs = 
<gadget id="calculator">16-6</gadget>
<output>10</output>
10 chefs left.
There are 16 waiters - 3 waiters = 
<gadget id="calculator">16-3</gadget>
<output>13</output>
13 waiters left.
In total there are 10 chefs + 13 waiters = 
<gadget id="calculator">10+13</gadget>
<output>23</output>
23 chefs and waiters left.

<result>23</result>