book Maths Puzzle Numerical Ability

Factor each polynomial completely

x^3y + 2x^2y^2 + xy^2

Is the common factor X^3 ? I am haveing a problem with figureing out the CF

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book Other Question

A rectangular garden is 15 by 12 meters, you need to have a rectangular area inside such that a uniform strip of side walk is made, the area inside has to be 108 square meters. Find the dimensions of the interior area. write the equation in standered form y=-2/7x-1