The hospital has 11 doctors and 18 nurses. If 5 doctors and 2 nurses quit, how many doctors and nurses are left?
There are 11 doctors - 5 doctors = 
<gadget id="calculator">11-5</gadget>
<output>6</output>
6 doctors left.
There are 18 nurses - 2 nurses = 
<gadget id="calculator">18-2</gadget>
<output>16</output>
16 nurses left.
In total there are 6 doctors + 16 nurses = 
<gadget id="calculator">6+16</gadget>
<output>22</output>
22 doctors and nurses left.

<result>22</result>