Question
Three girls, Gwen, Natalie and Sabrina had a total of 5640 pens. Some exchanges were made. First, Gwen gave Natalie as many pens as Natalie had. After that, Natalie gave 13 of whatever she had then to Sabrina. Finally, Sabrina 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, Natalie and Sabrina had a total of 5640 pens. Some exchanges were made. First, Gwen gave Natalie as many pens as Natalie had. After that, Natalie gave 13 of whatever she had then to Sabrina. Finally, Sabrina 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?