exam Maths Puzzle Numerical Ability

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 400 ft^2, what is the width of the path?

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exam Other Question

Two similar irregular heptagons are cut out of the same piece of paper, but they cannot completely cover each other. Why? 3r^3s^-5t over 2r^-3s^-5t4 I missed this on homework and need to correct. My answer was r^6 over t^4. Please help me solve and understand steps.