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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?

 Feb 6, 2020
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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

 Feb 6, 2020

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