exam Maths Puzzle Numerical Ability

How to simplify this expression?
(2m+3n/2m^2-5mn-12n^2)/(2m^2-7mn-4n^2/m^2-8mn+16n^2)

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exam Other Question

help me someone please? i am so lost with this.

Construction. A garden area is 30 ft long and 20 ft wide. A path of uniform width is set around the edge. If the remaining garden area is 400ft^2, what is the width of the path? use long division to solve:
(x^3+4x^2-3x-12) / (x^2-3)