Question
Three girls, Gwen, Gillian and Marion had a total of 2880 buttons. Some exchanges were made. First, Gwen gave Gillian as many buttons as Gillian had. After that, Gillian gave 15 of whatever she had then to Marion. Finally, Marion gave 13 of whatever she had to Gwen. As a result, they each had the same number of buttons. How many buttons did Gwen have at first?
5 m

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Three girls, Gwen, Gillian and Marion had a total of 2880 buttons. Some exchanges were made. First, Gwen gave Gillian as many buttons as Gillian had. After that, Gillian gave 15 of whatever she had then to Marion. Finally, Marion gave 13 of whatever she had to Gwen. As a result, they each had the same number of buttons. How many buttons did Gwen have at first?