Question

Lewis County, Washington, has a guideline that new roads should not exceed a 15% grade, or a 15 foot rise over a horizontal distance of 100 feet. A proposed roadway rises 41 feet over 254 feet horizontally. Find the grade of the proposed roadway to the nearest percent. Does it meet the county’s guideline?

Answer 1

To calculate this problem, divide the smaller number by the larger to get the grade or slope.
I.E.  15/100= .15 = 15%
     41/254 = .16 = 16%   NOPE, it doesnt meet county guidelines

    hope it helps