some hints
(1) if the object floats on a liquid with density = 1.05g/mL... is the objects
density < 1.05 g/mL or > 1.05 g/mL?
(2) if the object sinks in a liquid with density = 0.950 g/mL...
is the objects density > or < 0.950 g/mL??
(3) if the objects density is between 0.950 g/mL and 1.05 g/mL,
and if the objects mass = 5.55g
can you use d = mass / V to calculate a range of V's for the object?
(4) can you sort through the list of possibilities and spot which ones fall in that range?