Question 897754
He lost 220 - 180 = 40 pounds


Divide this by the original weight he starts with (220) to get 40/220


With all fractions, it's a good idea to reduce. So let's do so: 


40/220 = (4*10)/(22*10)


40/220 = 4/22


40/220 = (2*2)/(2*11)


40/220 = <font color="red">2/11</font>


He lost <font color="red">2/11</font> of his original weight. 


So if you multiplied 2/11 by 220, you should get 40.


(2/11)*220 = (2*220)/11 = 440/11 = 40


and we do, so that confirms the answer of <font color="red">2/11</font>