exam Maths Puzzle Numerical Ability

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A function F is defined by F(x)=2x+3, where x is a member of the real numbers, and a second function of G is defined by G(x)=(x^2+25)/(x^2-25), where x is a member of the real numb The perimeter of a rectangle is 66m. If the width were doubled and the length were increased by 22m, the perimeter would be 136m. What are the length and width of the rectangle?