I'm reading your question
Cone volume = Pi/3 (r^2* h)
Cylinder volumen = Pi r^2 * h
r= radius
h = height
_____________________________
Assuming that the water occupies the total area of the cone and cylinder
___________________________
the total volume of water
Cylinder volumen = Pi (2)^2 * (8)
cylinder volume = 3.11 * 4*8
= 100 . 48 in^3
______________________________________
Volume per paper water cup
Cone volume = 3.14/3 ((2)^2* 4)
= 16. 746 = 16.75
_______________________-
the number of full paper cups of water = Cylinder volume/ Cone volume
= 6
____________________________________
Answer
6 full paper cups of water are required to one water bottle
___________________
Do you have any questions regarding the solution?