Ok so as a whole there are 8/8 slices you take 5 away with green peppers so now you have 3 out of the 8 slices and you turn 2 of them into mushrooms. So you 1 slice left (no toppings). So in a grand total .625 % of the pizza is Green Peppers. And the mushrooms have covered .25 % of the pizza and the topping less slice with .125 % so the obvious topping is Green Peppers
Hope this helped
Mgd5805 :)