Question
Three girls, Gwen, Penelope and Emily had a total of 2940 erasers. Some exchanges were made. First, Gwen gave Penelope as many erasers as Penelope had. After that, Penelope gave 13 of whatever she had then to Emily. Finally, Emily gave 13 of whatever she had to Gwen. As a result, they each had the same number of erasers. How many erasers did Gwen have at first?
5 m

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Three girls, Gwen, Penelope and Emily had a total of 2940 erasers. Some exchanges were made. First, Gwen gave Penelope as many erasers as Penelope had. After that, Penelope gave 13 of whatever she had then to Emily. Finally, Emily gave 13 of whatever she had to Gwen. As a result, they each had the same number of erasers. How many erasers did Gwen have at first?