please help with my chemistry!

Question

A liquid solvent is added to a flask containing an insoluble solid. The total volume of the solid and liquid together is  The liquid solvent has a mass of  and a density of  Determine the mass of the solid given its density is 

Answer 1

Liquid: 38.7 g x 1 ml/0.865 g = ml of liquid

Vol of solid = 80.0 ml - ml of liquid

mass of solid = vol of solid x 2.75 g/ml

(100. g)

Answer 2

Liquid: 38.7 g x 1 ml/0.865 g = ml of liquid

Vol of solid = 80.0 ml - ml of liquid

mass of solid = vol of solid x 2.75 g/ml