Question
Three girls, Gabby, Jen and Roshel had a total of 3720 marbles. Some exchanges were made. First, Gabby gave Jen as many marbles as Jen had. After that, Jen gave 13 of whatever she had then to Roshel. Finally, Roshel 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, Jen and Roshel had a total of 3720 marbles. Some exchanges were made. First, Gabby gave Jen as many marbles as Jen had. After that, Jen gave 13 of whatever she had then to Roshel. Finally, Roshel 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?