A liquid solvent is added to a flask containing an insoluble solid. The total volume of the solid and liquid together is $86\mathrm{.}0mL.$ The liquid solvent has a mass of $29\mathrm{.}0g$ and a density of $0\mathrm{.}865\frac{g}{m}L.$ Determine the mass of the solid given its density is $3\mathrm{.}25\frac{g}{m}L.$