exam Maths Puzzle Numerical Ability

Please help me solve this equation:

The length of a rectangular room is 3 feet less than twice its width. Find the dimensions of the room if the perimeter is 54 feet.

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exam Other Question
1. (3x^2-5x+2)(3x^2-5x-2)=21
2. (x/x+2)^2 -7(x/x+2)+12=0; x is not= -2
3. solve: a/ax-1 + b/bx-4 =a+b
4. 1/p+1/q+1/x = 1/x+p+q is x-1 a factor of -3x^4+x^3-5x^2+2x+4