Question
Xylia, Shiyun and Gwen have 264 marbles. Xylia has 56 as many marbles as Shiyun. Gwen's marbles is 15 of the total number of Xylia's and Shiyun's marbles. How many marbles must Shiyun give to Gwen so that both Xylia and Gwen will have the same number of marbles?
4 m

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Xylia, Shiyun and Gwen have 264 marbles. Xylia has 56 as many marbles as Shiyun. Gwen's marbles is 15 of the total number of Xylia's and Shiyun's marbles. How many marbles must Shiyun give to Gwen so that both Xylia and Gwen will have the same number of marbles?