Question

A new sidewalk will be 5 feet​ wide, 100 feet​ long, and filled to a depth of 3 inches ​(0.25 ​foot) with concrete. How many cubic yards of concrete are​ needed?

Answer 1

4.63 cubic yard.

Explanation:

Given,

The length of sidewalk, l = 100 feet,

Width, w = 5 feet,

Depth, h = 3 inches = 0.25 feet,

Thus, the volume of the concrete needed for making the sidewalk,

`V=l* w* h`

`=100* 5* 0.25`

= 125 cubic feet,

∵ 1 cubic yard = 27 cubic feet,

⇒ 1 cubic feet =
`(1)/(27)` cubic yard,

Thus, the quantity of concrete needed =
`(125)/(27)` ≈ 4.63 cubic yard.