Question
Three girls, Eva, Jen and Joelle had a total of 3420 cards. Some exchanges were made. First, Eva gave Jen as many cards as Jen had. After that, Jen gave 13 of whatever she had then to Joelle. Finally, Joelle gave 15 of whatever she had to Eva. As a result, they each had the same number of cards. How many cards did Eva have at first?
5 m

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Three girls, Eva, Jen and Joelle had a total of 3420 cards. Some exchanges were made. First, Eva gave Jen as many cards as Jen had. After that, Jen gave 13 of whatever she had then to Joelle. Finally, Joelle gave 15 of whatever she had to Eva. As a result, they each had the same number of cards. How many cards did Eva have at first?