Jane, Susan and Lilly have 4x, 7x and 5x dollars, respectively, where x is some unknown amount of dollars.


The condition says

4x + 15 = 7x - 15,


which implies

15 + 15 = 7x - 4x,   or

30 = 3x  ====>  x =  = 10 dollars.


Answer.  Lilly has 5*10 = 50 dollars.

They all can't have the same amount after Susan gives $15 to Jane.

Therefore, by "they each had the same amount of money," you must mean Jane and Susan. As such, Lily has  

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