Calculate concrete mix component quantities. A project requires $750CY$ of concrete that will be

mixed on$-$site. Each cubic yard of this mix requires the following:

The sand and gravel will be sourced from a yard that has sand with $5\%$ excess moisture and

gravel with $3\%$ excess moisture. Specific gravity values: cement$=3\mathrm{.}15,$ gravel$=2\mathrm{.}65,$ sand$=2\mathrm{.}65,$

and water $=1\mathrm{.}0.1-$sack of cement is $94lbs.$ Density of water $=62\mathrm{.}4lb\frac{s}{c}$uft.

a$.$ What is the density $($in $l\frac{b}{f}{t}^3)$ of this concrete?

b$.$ What is the volume of air $($in $\%)?$

c$.$ What quantity $($in tons$)$ of sand should be ordered?

d$.$ What quantity $($in tons$)$ of gravel should be ordered?