Question
Three girls, Gwen, Xuan and Diana had a total of 2280 pens. Some exchanges were made. First, Gwen gave Xuan as many pens as Xuan had. After that, Xuan gave 13 of whatever she had then to Diana. Finally, Diana gave 15 of whatever she had to Gwen. As a result, they each had the same number of pens. How many pens did Gwen have at first?
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Three girls, Gwen, Xuan and Diana had a total of 2280 pens. Some exchanges were made. First, Gwen gave Xuan as many pens as Xuan had. After that, Xuan gave 13 of whatever she had then to Diana. Finally, Diana gave 15 of whatever she had to Gwen. As a result, they each had the same number of pens. How many pens did Gwen have at first?