Question
Three girls, Yen, Nora and Jen had a total of 1680 coins. Some exchanges were made. First, Yen gave Nora as many coins as Nora had. After that, Nora gave 13 of whatever she had then to Jen. Finally, Jen 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, Nora and Jen had a total of 1680 coins. Some exchanges were made. First, Yen gave Nora as many coins as Nora had. After that, Nora gave 13 of whatever she had then to Jen. Finally, Jen 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?