Question

A new sidewalk will be 4 ft wide, 280 ft long, and filled to a depth of 9 inches (0.75 ft) with concrete. How many cubic yards of concrete are needed?

Answer 1

Volume of the pit is
`31.11` cubic yards.

Explanation:

First lets change all the values to yards.

1 yard = 3 foot

Width in yards =
`(4)/(3)` yards

Length in yards =
`(280)/(3)` yards

Depth in yards =
`(0.75)/(3)` yards

Volume of the pit = Length * Width * Depth

=
`(4)/(3) *(280)/(3) *(0.75)/(3)`

=
`(4*280*0.75)/(3*3*3)`

=
`(840)/(27)`

=
`31.11` cubic yards.

Volume of the pit is
`31.11` cubic yards.