Dylan and Leon had an equal number of bookmarks. After Dylan gave away 45 bookmarks and Leon gave away 60 bookmarks, Dylan had 4 times as many bookmarks as Leon. How many bookmarks did each have at first?
D - 45 = 4 [ L - 60 ]
But,at first, D = L ...so....
D - 45 = 4 [ D - 60 ]
D - 45 = 4D - 240
240 - 45 = 4D - D
195 = 3D
195 / 3 = D = 65
Each started with 65
