exam Maths Puzzle Numerical Ability

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.

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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? Karen is 15 years older than Kyla. 13 years from now the sum of their ages will be 109. Give the current ages of Karen and Kyla.