quantitative literacy practice

Question

A new sidewalk will be 55 feet​ wide, 240 feet​ long, and filled to a depth of 33 inches ​(0.25 ​foot) with concrete. How many cubic yards of concrete are​needed?

Answer 1

The volume of the concrete slab is 55 x 240 x .25 = 3300 ft³

Then,

3300 ft³ x (1 yard/3 ft)³ = 3300/27 = 122.22 yds³