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=<<6/2=3>>3 trees
Harry:5+2(3)=5+6=11 trees
11-3=<<11-3=8>>8 trees
#### 8