How does the density of a body and that of a liquid determine whether the body will float or sink into that liquid?

State the law of floatation?

Explain the meaning of the statement 'Relative density of aluminium is 2.7'.

Which of the following will sink or float on water? (Density of water = 1 g cm^-3)

1. Body A having density 500 kg m^-3
2. Body B having density 2520 kg m^-3
3. Body C having density 1100 kg m^-3
4. Body D having density 0.85 g cm^-3