**The American with Disabilities Act (ADA) requires that the slope of a wheelchair ramp be no greater than 1:12. Which of the following is the minimum length of a ramp needed to provide access to a door that is 1.5 feet above the sidewalk?**

12 feet

4.5 feet

3 feet

18 feet

*Correct Answer : D*

We use the given slope to find the minimum length of the ramp. In this case, slope is the ratio of height to length of the lamp. Thus,

If we let x be the minimum length of the ramp. Then,

Substituting the value of slope into the above equation results in,

Solve for value of x by cross-products

*X = 18 Feet*

Thus, the minimum length of the ramp needed to provide access to a door that is 1.5 high is 18 feet.

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### Correct Answer is B

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