Question
Three girls, Yen, Lynn and Lucy had a total of 810 cards. Some exchanges were made. First, Yen gave Lynn as many cards as Lynn had. After that, Lynn gave 14 of whatever she had then to Lucy. Finally, Lucy gave 14 of whatever she had to Yen. As a result, they each had the same number of cards. How many cards did Yen have at first?
5 m

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Three girls, Yen, Lynn and Lucy had a total of 810 cards. Some exchanges were made. First, Yen gave Lynn as many cards as Lynn had. After that, Lynn gave 14 of whatever she had then to Lucy. Finally, Lucy gave 14 of whatever she had to Yen. As a result, they each had the same number of cards. How many cards did Yen have at first?