A grade beam is 300 lf long, 24 in wide, and 18 in deep. Including 5% waste, how many cubic yards of concrete should be carried?
Correct Answer
A) 35.0 cy
Convert 24 in to 2 ft and 18 in to 1.5 ft. Volume including allowance = 300 × 2 × 1.5 ÷ 27 × 1.05 = 35.0 cy. Keeping full precision prevents error from rounding the base 33.333… cy early.
Why This Is the Correct Answer
Convert 24 in to 2 ft and 18 in to 1.5 ft. Volume including allowance = 300 × 2 × 1.5 ÷ 27 × 1.05 = 35.0 cy. Keeping full precision prevents error from rounding the base 33.333… cy early.
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