(a) The Americans with Disabilities Act states, "The maximum slope of a ramp in new construction shall be 1:12. The maximum rise for any run shall be 30 in." What is the minimum amount of run for a rise of 27 inches? (b) A certain highway undergoes a difference in elevation of 1500 feet in 9 miles. What is the average percent slope of the highway's grade? (a) The minimum amount of run is feet. (Simplify your answer.) (b) The average percent slope of the highway's grade is approximately %. (Round to the nearest whole number as needed.)

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