Ronnie, Mack, Kim and Ada together stack a total of 40 pizzas in a pan Ronnie stacked 0.25 of the pizzas. Mack stacked nine of the 40 pizzas Kim stack 35% of the pizzas and stack the remaining pieces who stacked the most pizzas.
To find out who stacked the most pizzas, we'll compare the number of pizzas stacked by each person.
Ronnie stacked 0.25 * 40 = <<0.25*40=10>>10 pizzas.
Mack stacked 9 pizzas.
Kim stacked 35/100 * 40 = <<35/100*40=14>>14 pizzas.
Ada stacked the remaining pizzas, which is 40 - (10 + 9 + 14) = <<40-(10+9+14)=7>>7 pizzas.
Therefore, Kim stacked the most pizzas with a total of 14.