Question
Three girls, Gabby, Hilda and Tiffany had a total of 5400 marbles. Some exchanges were made. First, Gabby gave Hilda as many marbles as Hilda had. After that, Hilda gave 15 of whatever she had then to Tiffany. Finally, Tiffany gave 13 of whatever she had to Gabby. As a result, they each had the same number of marbles. How many marbles did Gabby have at first?
5 m

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Three girls, Gabby, Hilda and Tiffany had a total of 5400 marbles. Some exchanges were made. First, Gabby gave Hilda as many marbles as Hilda had. After that, Hilda gave 15 of whatever she had then to Tiffany. Finally, Tiffany gave 13 of whatever she had to Gabby. As a result, they each had the same number of marbles. How many marbles did Gabby have at first?