Keep in mind that this is not a DS question, and thus in the wrong subforum.
This one is easily solved via some quick algebra; let x be the amount (in feet) that the tree grows each year.
So, setting up the equation, we have
(6/5) * (4 + 4x) = 4 + 6x
24/5 + 24x/5 = 4 + 6x
4/5 = 6x/5
4 = 6x
x = 4/6 = 2/3.
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