SOLUTION: A recommendation for wheelchair ramps is that the rise-to-run ratio be no greater than 1:12. This ensures that the ramps are navigable by people in wheelchairs. If a business nee

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Question 1182634: A recommendation for wheelchair ramps is that the rise-to-run ratio be no greater than 1:12. This ensures that the ramps are navigable by people in wheelchairs. If a business needs to install a concrete ramp to the entrance of their building, which is 12 inches off the ground, how long should the ramp be and how far out horizontally on the ground will it protrude from the building? Give answers in feet and inches, such as 5 feet, 4 inches. What percent grade is the ramp?
Answer by ikleyn(52776) About Me  (Show Source):
You can put this solution on YOUR website!
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According to the given requirements, the length (the run) of the ramp should be at least 12 times the height (the rise).


It means that the run must be at least 12 * 12 = 144 inches, or  144%2F12 = 12 feet.    ANSWER


In terms of percentage, the grade of the ramp (which term is the same as the slope) is


    the grade of the ramp = the rise divided by the run <= %281%2F12%29%2A100 = 8.33%.      ANSWER

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