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