Question
Three girls, Jen, Yoko and Shannon had a total of 1320 marbles. Some exchanges were made. First, Jen gave Yoko as many marbles as Yoko had. After that, Yoko gave 15 of whatever she had then to Shannon. Finally, Shannon gave 13 of whatever she had to Jen. As a result, they each had the same number of marbles. How many marbles did Jen have at first?
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Three girls, Jen, Yoko and Shannon had a total of 1320 marbles. Some exchanges were made. First, Jen gave Yoko as many marbles as Yoko had. After that, Yoko gave 15 of whatever she had then to Shannon. Finally, Shannon gave 13 of whatever she had to Jen. As a result, they each had the same number of marbles. How many marbles did Jen have at first?