The formula which relates the density of a body, it's volume and it's mass is as follows:

density = (mass)/(volume)

So, after rearranging:
mass = (density) x (volume)

Substituting the values:
volume = 25cc and density = 7.6 g/cm3

mass = (7.6) x (25) = 190g

So, the mass of the body is 190 grams.

Hope I have answered your question. All the best!