Archimedes principle can be used not only to determine the

Archimedes principle can be used not only to determine the specific gravity of a solid using a known liquid (Example 10-8); the reverse can be done as well.
(a) As an example, a 3.40-kg aluminum ball has ab apparent mass of 2.10 kg when submerged in particular liquid; calculate the density of the liquid.
(b) Derive a formula for determining the density of a liquid using this procedure