Adam, Andrew and Ahmed all raise goats.  Adam has 7 goats.  Andrew has 5 more than twice as many goats as Adam.  Ahmed has 6 fewer goats than Andrew.  How many goats does Ahmed have?
Andrew: 5+2(7)=19 goats.
Ahmed:19-6=
<gadget id="calculator">19-6</gadget>
<output>13</output>
13 goats.

<result>13</result>