book Maths Puzzle Numerical Ability

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y=16-x^2
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In a walkathon to raise money, Elisa walked a certain distance at 5 mph and then jogged twice that distance at 8mph. Her total time walking and jogging was 2 hours and 15 minutes. A family plans to surrond their pool with a patio of constant width. The pool has an area of 150 square feet. The dimensions of the pool with the patio will be 15 feet by 20 feet. Find the dimensions of the pool.