Question

if density is given find least count

Answer 1

not possible question

Answer 2

Divide 1 cm into that much number of divisions; the value obtained is the least count of the main scale in cm. For example, if there are 10 divisions in one centimeter of the main scale its least count = 1/10 = 0.01 cm. Number of divisions on Vernier scale : In most Vernier calipers, the vernier scale has 10 divisions.

In your question where is density