Hi,

Let x and (20-x) represent the two parts

    3x^2 -10 = (20-x)

    3x^2 + x -30 = 0

    (3x +10)(x-3) = 0,  x =  3      (Tossing out the negative solution for unit measure)

And...Checking

   27 -10 = 20-3 = 17 

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