There are 6 trees in Chris's yard.  Ferdinand has half the number of trees that Chris has.  Harry has 5 more than twice the number of trees that Ferdinand has.  How many more trees are in Harry's yard than Ferdinand's yard?
Ferdinand:6/2=
<gadget id="calculator">6/2</gadget>
<output>3</output>
3 trees.
Harry:5+2(3)=5+6=11 trees
11-3=
<gadget id="calculator">11-3</gadget>
<output>8</output>
8 trees.

<result>8</result>