During a staff meeting, 50 doughnuts were served. If each of the 19 staff ate 2 doughnuts, how many doughnuts are left?
The staff had eaten a total of 19 x 2 = 
<gadget id="calculator">19*2</gadget>
<output>38</output>
38 doughnuts.
So, 50 - 38 = 
<gadget id="calculator">50-38</gadget>
<output>12</output>
12 doughnuts are left.

<result>12</result>