exam Maths Puzzle Numerical Ability

Solve the following equations. Construction.A garden area is 30ft long and 20ft wide. A path of uniform width is set around the edge. If the remaining garden is 400ft^2, what is the width of the path?

I am needing some help with this one. Thanks

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help me with this problem: 7/x^2-3x - 3/x = 5/3-x The number of bacteria in a large sealed jar doubles every minute. An hour after the first bacteria was put into the jar and sealed in, the jar was full. When was it half full?