Density is given by the formula [tex]D= \frac{m}{v}[/tex], where D is equal to the density, m is mass of lead and v the volume of lead.
Since we are not given an initial volume the change in volume is caused by the piece of lead which is a 3ml.
Therefore,
[tex]D=\frac{m}{v} =\frac{25}{3}= 8.33 g/ml[/tex]
