Question

PLS ANSWER THIS QUESTION I WANT THIS IN URGENT....

Answer 1

 consider the frustrum of height h and radii, r₂, r₁
we know that
$then V= \frac{ \pi h}{3} \frac{ r_{2} ^{3} - r_{1} ^{3}}{r_{2} - r_{1}}$
 solving for h
h= 15cm