Question
Three girls, Kathy, Nora and Eva had a total of 1620 erasers. Some exchanges were made. First, Kathy gave Nora as many erasers as Nora had. After that, Nora gave 13 of whatever she had then to Eva. Finally, Eva gave 15 of whatever she had to Kathy. As a result, they each had the same number of erasers. How many erasers did Kathy have at first?
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Three girls, Kathy, Nora and Eva had a total of 1620 erasers. Some exchanges were made. First, Kathy gave Nora as many erasers as Nora had. After that, Nora gave 13 of whatever she had then to Eva. Finally, Eva gave 15 of whatever she had to Kathy. As a result, they each had the same number of erasers. How many erasers did Kathy have at first?