A soil sample has avoid ratio of $0\mathrm{.}72,$ moisture content $=12\%$ and Gs $=2\mathrm{.}72$

determine the following: a$)$ Dry unit weight, moist unit weight $($KN$/$m$3).$ b$)$ Weight of

water in KN$/$m$3$ to be added for $80\%$ degree of saturation. c$)$ Is it possible to reach a

water content of $30\%$ without change the present void ratio. d$)$ Is it possible to compact

the soil sample to a dry unit weight of $23\mathrm{.}5$ KN$/$m$3$