For every 1 inch rise the ramp must extend 12
inches.
Therefor:
For a rise
of n inches the ramp must extend by n*12 inches.
The
required rise = n = 18
inches.
Therefore:
The
required length of ramp = 18*12 = 216 inches
This is
equivalent to 216/12 = 18
feet.
Answer:
Distance of end
of ramp from building = 18 feet.
An alternative, quicker
way to solve this problem is as follows:
As the ramp must
extend 1 foot (12 inches) for every 1 inch rise, the ramp must extend by 18 feet for 18
inches rise.
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