Question
Three girls, Yen, Natalie and Nicole had a total of 4920 coins. Some exchanges were made. First, Yen gave Natalie as many coins as Natalie had. After that, Natalie gave 13 of whatever she had then to Nicole. Finally, Nicole gave 15 of whatever she had to Yen. As a result, they each had the same number of coins. How many coins did Yen have at first?
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Three girls, Yen, Natalie and Nicole had a total of 4920 coins. Some exchanges were made. First, Yen gave Natalie as many coins as Natalie had. After that, Natalie gave 13 of whatever she had then to Nicole. Finally, Nicole gave 15 of whatever she had to Yen. As a result, they each had the same number of coins. How many coins did Yen have at first?