Find the Area of a part of a Parellogram

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ABCD is a parallelogram. P is any point on CD such that $ar(\triangle DPA) = 15 cm^2$
and $ar(\triangle APC) = 20 cm^2$. Find the area of $ar(\triangle APB)$.

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Here is a solution:

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I believe that the rest of the problem can be done by you.