Question

steve has 500 more marbles than richard at first. he gives 300 marbles to richard. who has more marbles now, and by how many?

Answer 1

Steve has x+500 marbles
richard has x marbles

if steve gives richard 300 marbles then
x+500-300        x+300
so x+200 and  x+300
richard has more and by 100

Answer 2

Well Richard definetly has more now. Even is he started off with 0, he gains 300, and Steve only has 200 now, i dont think you can find out how many more, you'd need how much Richard started out with, or at least the total number of marbles. Hope that helped!! :-D