Question
Three girls, Lynn, Kathy and Penelope had a total of 2640 erasers. Some exchanges were made. First, Lynn gave Kathy as many erasers as Kathy had. After that, Kathy gave 15 of whatever she had then to Penelope. Finally, Penelope gave 13 of whatever she had to Lynn. As a result, they each had the same number of erasers. How many erasers did Lynn have at first?
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Three girls, Lynn, Kathy and Penelope had a total of 2640 erasers. Some exchanges were made. First, Lynn gave Kathy as many erasers as Kathy had. After that, Kathy gave 15 of whatever she had then to Penelope. Finally, Penelope gave 13 of whatever she had to Lynn. As a result, they each had the same number of erasers. How many erasers did Lynn have at first?