It was Trevor's job to collect fresh eggs from the family's 4 chickens every morning.   He got 4 eggs from Gertrude and 3 eggs from Blanche.  Nancy laid 2 eggs as did Martha.  On the way, he dropped 2 eggs.  How many eggs did Trevor have left?
He collected 4+3+2+2 eggs for a total of 
<gadget id="calculator">4+3+2+2</gadget>
<output>11</output>
11 eggs.
He dropped 2 eggs so 11-2 = 
<gadget id="calculator">11-2</gadget>
<output>9</output>
9 eggs left.

<result>9</result>