Question
Three girls, Yen, Natalie and Esther had a total of 3540 stickers. Some exchanges were made. First, Yen gave Natalie as many stickers as Natalie had. After that, Natalie gave 13 of whatever she had then to Esther. Finally, Esther gave 15 of whatever she had to Yen. As a result, they each had the same number of stickers. How many stickers did Yen have at first?
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Three girls, Yen, Natalie and Esther had a total of 3540 stickers. Some exchanges were made. First, Yen gave Natalie as many stickers as Natalie had. After that, Natalie gave 13 of whatever she had then to Esther. Finally, Esther gave 15 of whatever she had to Yen. As a result, they each had the same number of stickers. How many stickers did Yen have at first?