Codes & Safety第 111 / 120 题
A floor plan is drawn at a scale of 1/4 in = 1 ft. A straight run of cold water piping measures 3-1/2 in on the drawing. What is the actual length of that run?
a.3 ft 6 in
b.10 ft 6 in
c.14 ft
d.17 ft 6 in
解析
At 1/4 in = 1 ft, every full inch on the drawing represents 4 ft, so 3.5 in x 4 ft = 14 ft. Reading 3 ft 6 in simply repeats the measured inches as feet and ignores the scale entirely. Ten feet six inches comes from multiplying by 3 instead of 4, and 17 ft 6 in comes from multiplying by 5. Checking the answer the other way confirms it: 14 ft x 1/4 in per ft = 3.5 in on paper.
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