Problem $3$ In a laboratory session, we obtained the following results on an undisturbed sample of clayey soil:

Specific gravity: $2\mathrm{.}65$

Mass of wet specimen: $235g$

Mass of dry specimen: $135g$

Calculate the total volume and porosity of the specimen for the condition that it is: $($a$)$ fully $(100\%)$ saturated; $($b$)25\%$ saturated.