A survey crew worker uses a site instrument that is on a 4-ft stand. He sites a spot on the road 66 feet away. What is the grade, to the nearest whole percent?
As we know that:
grade = riserun100\cfrac{rise}{run} 100runrise100
grade = 46(100)\cfrac{4}{6} (100)64(100)
Grade = 66.67%
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