Ahmed has 4 times as many apple trees as Hassan who has 1 apple tree so Ahmed has 4*1 = <<4*1=4>>4 apple trees
Ahmed has 8 orange trees in addition to the apple trees for a total of 8+4 = <<8+4=12>>12 trees
Hassan has 1+2 = <<1+2=3>>3 trees in his orchard
Ahmed has 12-3 = <<12-3=9>>9 more trees than Hassan
#### 9