Mr. macady has an old cylindrical grain silo on his farm that stands 25 feet high with a diameter of 10 feet. mr. macady is planning to tear down the old silo and replace it with a new and bigger one. the new cylindrical silo will stand 30 feet high and have a diameter of 15 feet. a. what is the volume of the old silo b. what is the volume of the new silo c. how much greater is the volume of the new silo than the old silo

To answer this question you will need to calculate the volume of each prism. To do this you will find the area of the base of Cylinder (pi x radius squared) and multiply it by the height. Please see the work for the formula and correct substitution.
The volume is the space the silos hold.

Here are the answers:
A. 1962.5 square feet
B. 5298.74 square feet
C. 3335.25 square feet

20:4 and 40:8 I think