Mary, Nicholas and Yvonne have 678 bookmarks. Mary has 4 times as many bookmarks as Nicholas. Yvonne has 417 bookmarks more than Mary. How many bookmarks does Mary have?
Let Nicolas's bookmarks =N Mary's bookmarks =4N Yvonne's bookmarks =4N + 417 N + 4N + 4N +417 =678 9N =678 - 417 9N =261 N = 261 / 9 N = 29 - bookmarks that Nicolas has 4 x 29 = 116 bookmarks that Mary has
