Find the approximate area of an irregular lamina of which boundary line is drawn on the graph paper shown in figure below.

A piece of brass of volume 30 cm³ has a mass of 252 g. Find the density of brass in:

(i) g cm^-3

(ii) kg m^-3

A cork has a volume 25 cm³. The density of cork is 0.25 g cm^-3. Find the mass of the cork.

The mass of 5 litre of water is 5 kg. Find the density of water in g cm^-3.