Find the volum of the and minus pi x2.5 squared x4
Proof with explanation:
We know that the sum of first 'n' terms of a Geometric progression is given by

where
a = first term of G.P
r is the common ratio
'n' is the number of terms
Thus the sum of 'n' terms is

Now the sum of first '2n' terms is

Now the sum of terms from
to
term is 
Thus the ratio becomes

So looking at this from my bed, as a bored 11 year old, 2,910 is the rounded version of 2,912. Not to make you do work or anything but 2,910 divided by 95!
The answer is 60... if one in. is 75... 0.8 obviously is not 75.