Trane has 145 marbles. He gives 20 to Katie, 52 to Gwen, and 31 to Yusef. He keeps the rest. Who has the most marbles? Trane Katie Gwen Yusef Solution Trane has 145 marbles , he gave 20 to Katie and 52 to Gwen , and 31 to Yusef. It means now Katie has = 20 , Gwen has = 52 Yusef has = 31 and Trane has =145 -20 -52 -31 = 42 It means Gwen has the most marbles , that is 52.