Question

If a concrete mix contains 1-1/2 cubic feet of gravel, 1/2 cubic foot of water,

1 cubic foot of cement, and 2 cubic feet of sand, what percentage of the mix is
sand?

Answer 1

The correct answer is "50%".

Explanation:

The given values are:

Gravel,

=
`(1-(1)/(2) )`

Water,

=
`(1)/(2)`

Cement,

= 1

Sand,

= 2

Now,

The total mixture will be:

=
`Gravel+Water+Cement+Sand`

By substituting the values, we get

=
`(1-(1)/(2) )+(1)/(2) +1+2`

=
`(1)/(2) +(1)/(2) +1+2`

=
`4 \ cubic \ feet`

hence,

The percentage of sand will be:

=
`(Sand)/(Total)* 100`

=
`(2)/(4)* 100`

=
`50`%