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30 questions from the concrete and masonry practice test.
10 questions, graded as you go, with the reason for every answer. No sign-up.
How many cubic yards of concrete are needed for a slab 20 ft by 30 ft and 4 in. thick? Do not add waste.
Answer in cu yd.
7.41 cu yd
Thickness = 4/12 = 0.333 ft. Volume = 20 x 30 x 0.333 = 200 cu ft. 200 / 27 = 7.41 cu yd.
Reference: Concrete estimating: volume in cubic yards
A continuous footing is 2 ft wide, 1 ft deep and 120 ft long. How many cubic yards of concrete does it take?
Answer in cu yd.
8.89 cu yd
Volume = 2 x 1 x 120 = 240 cu ft. 240 / 27 = 8.89 cu yd.
Reference: Concrete estimating: volume in cubic yards
A wall is 8 in. thick, 9 ft high and 60 ft long. How many cubic yards of concrete are needed?
Answer in cu yd.
13.33 cu yd
Thickness = 8/12 = 0.667 ft. Volume = 0.667 x 9 x 60 = 360 cu ft. 360 / 27 = 13.33 cu yd.
Reference: Concrete estimating: volume in cubic yards