Question
Three girls, Nora, Shannon and Rachel had a total of 3420 marbles. Some exchanges were made. First, Nora gave Shannon as many marbles as Shannon had. After that, Shannon gave 14 of whatever she had then to Rachel. Finally, Rachel gave 14 of whatever she had to Nora. As a result, they each had the same number of marbles. How many marbles did Nora have at first?
5 m

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Three girls, Nora, Shannon and Rachel had a total of 3420 marbles. Some exchanges were made. First, Nora gave Shannon as many marbles as Shannon had. After that, Shannon gave 14 of whatever she had then to Rachel. Finally, Rachel gave 14 of whatever she had to Nora. As a result, they each had the same number of marbles. How many marbles did Nora have at first?