NCARB Practice Question  Ramps/Slopes
Could someone help me understand the answer below. What is a good recourse to study ramps and slopes and questions like these? Thank you.

Hi Neada,
First, you need to understand what is a 1:16 slope. It means in every 16 feet length, the slope rises 1 foot. So since the question says the length of the ramp is 28 feet, we need to find the rise of this ramp. We can use the proportion between 16 feet and 28 feet based on the given ratio of the slope which is 1:16. So the equation goes like this: IF, a slope rises 1 foot in every 16 feet, how much would it rise in 28 feet? To find it you need to divide 28 by 16 which is 1.75 feet.
1.75 feet = 21 inches. We converted it to inches because the riser height is given in inches. So to elevate 21 inches, you need 21”/6” (max height per riser) = 3.5, round up = 4 Risers. We must round up because if we did 3 risers, each riser was going to be 7” (21/3). Since the question says max 6” per riser, we will need 4 risers and each one of them will be 5.25”(21/4), which is below the max 6”requirement. Solving a lot of practice questions is the best way to study how to calculate ramps/risers. Hope this helps!
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