Question

A rectangular prism is truncated removing 10% of its height. The original height of the prism was 100 meters and it has a length of 4 meters and a width of 20 meters. What is the volume of the truncated prism?

800 m3

4,200 m3

3,800 m3

7,200 m3

Answer 1

my answer is 7,200 m3

Answer 2

http://www.math.com/tables/geometry/volumes.htm
rectangular prism vol = l x w x h
original vol = 8000
vol is linearly dependent on height
new vol = 90% of 8000
Looks good.

Answer 3

it is 7200m3