v = 11.775
The volume of a cone is v = π r^2 h/3
r: d/2 --> 3/2 --> 1.5
h: 5
v = π 1.5^2 5/3
v = π (2.25) (1.67)
v = π (3.75)
v = 11.775
And there you have it! The volume of the paper weight is 11.775.
Hope this helps!
Let me know if you need anything else :)