Question:
The material of a cone is converted into the shape of a cylinder of equal radius. If height of the cylinder is 5 cm, then height of the cone is
(a) 10 cm
(b) 15 cm
(c) 18 cm
(d) 24 cm
Solution:
A cone is converted into a cone.
So,
Volume of cone = Volume of cylinder
$h=15 \mathrm{~cm}$
Hence, the correct answer is choice (b).