exam Maths Puzzle Numerical Ability

x/x^2+4x-21-x/x^2-49

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exam Other Question

The perimeter of the rectangle is 190 inches. The length exceeeds the width by 53 inches. Find the length and the width.

Can someone please help with this one please? The perimeter is the 190 diveded by 4? Is that the way to start or not?
10/21=5/16a