Question 626344
A cylinder has its height doubled and its radius cut to one-third.
 What is the ratio of the volumes of the modified cylinder to the original cylinder?
:
Let original cylinder have a radius of 9, a height of 10
:
{{{old/new}}} = {{{(pi*9^2*10)/(pi*3^2*20)}}} = {{{2544.690049/565.4866776}}} = 4.5 or a ratio of 9:2