Question
Three girls, Shiyun, Usha and Xylia had a total of 4020 beads. Some exchanges were made. First, Shiyun gave Usha as many beads as Usha had. After that, Usha gave 13 of whatever she had then to Xylia. Finally, Xylia gave 13 of whatever she had to Shiyun. As a result, they each had the same number of beads. How many beads did Shiyun have at first?
5 m

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Three girls, Shiyun, Usha and Xylia had a total of 4020 beads. Some exchanges were made. First, Shiyun gave Usha as many beads as Usha had. After that, Usha gave 13 of whatever she had then to Xylia. Finally, Xylia gave 13 of whatever she had to Shiyun. As a result, they each had the same number of beads. How many beads did Shiyun have at first?