Ed had 14 more marbles than Doug. Doug lost 12 of his marbles at the playground while Ed found 36 more marbles. How many more marbles did Ed have than Doug then?
Doug had 12 fewer marbles than he started with. 
Ed had 36 more marbles than he started with. 

That means that Doug now has 

14 - 12 = 2 

marbles and Ed now has 

14 + 36 = 50 

marbles. 

Ed has 50 - 2 = 48 more marbles than Doug.