Question
Roshel, Kathy and Erika have 220 marbles. Roshel has 56 as many marbles as Kathy. Erika's marbles is 13 of the total number of Roshel's and Kathy's marbles. How many marbles must Kathy give to Erika so that both Roshel and Erika will have the same number of marbles?
4 m

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Roshel, Kathy and Erika have 220 marbles. Roshel has 56 as many marbles as Kathy. Erika's marbles is 13 of the total number of Roshel's and Kathy's marbles. How many marbles must Kathy give to Erika so that both Roshel and Erika will have the same number of marbles?