Weighted calculation

Question

Hi,

I am trying to figure out the correct weighted calculation for the following scenario. If I have a man with 30% body fat who reduces it down to 15% over time and another man who has a 17% body fat that reduces it down to 7% what calculation would I use to calculate the weighted difference whereas the man with the largest delta shows a great return?

Answer 1

(mana-70%)/2=15%

Use again for manb; by changing the values. 7%=.07