Ben has 20 eggs in the fridge. Yesterday, he ate 4 eggs in the morning and 3 in the afternoon. How many eggs does Ben have now?
Ben ate 4 + 3 = 
<gadget id="calculator">4+3</gadget>
<output>7</output>
7 eggs yesterday.
So he will have left 20 - 7 = 
<gadget id="calculator">20-7</gadget>
<output>13</output>
13 eggs.

<result>13</result>