Apple Picking Puzzle

Three people picked 65 apples altogether. At the first tree they each picked the
same number of apples. At the second tree they each picked 3 times as many as
they picked at the first tree. When they finished at the third tree, the group
had 5 times as many apples as they had when they started at that tree. At the
fourth tree the group picked just 5 apples.

How many apples did each person pick at the first tree?

Please click here for the solution.