Question
Three girls, Eva, Barbara and Yen had a total of 3960 marbles. Some exchanges were made. First, Eva gave Barbara as many marbles as Barbara had. After that, Barbara gave 15 of whatever she had then to Yen. Finally, Yen gave 14 of whatever she had to Eva. As a result, they each had the same number of marbles. How many marbles did Eva have at first?
5 m

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Three girls, Eva, Barbara and Yen had a total of 3960 marbles. Some exchanges were made. First, Eva gave Barbara as many marbles as Barbara had. After that, Barbara gave 15 of whatever she had then to Yen. Finally, Yen gave 14 of whatever she had to Eva. As a result, they each had the same number of marbles. How many marbles did Eva have at first?