Question
Three girls, Shiyun, Barbara and Xandra had a total of 660 coins. Some exchanges were made. First, Shiyun gave Barbara as many coins as Barbara had. After that, Barbara gave 13 of whatever she had then to Xandra. Finally, Xandra gave 15 of whatever she had to Shiyun. As a result, they each had the same number of coins. How many coins did Shiyun have at first?
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Three girls, Shiyun, Barbara and Xandra had a total of 660 coins. Some exchanges were made. First, Shiyun gave Barbara as many coins as Barbara had. After that, Barbara gave 13 of whatever she had then to Xandra. Finally, Xandra gave 15 of whatever she had to Shiyun. As a result, they each had the same number of coins. How many coins did Shiyun have at first?