Question

the height of the cone is 120cm.a small cone is cut off at the top by a plane parallel to the base and its volume is 1/4th the volume of original cone the height from the base of which the section is made is

Answer 1

frustum
$120 = 1 \div 4 \\ 120 \div 4 \\ 30$
the small cone is 30
and frustum is 90

Answer 2

Answer:

are you sure the question is right? shouldnt it be 1/64?