5. Five marks example problem I

A right circular cylindrical container of base radius $6 \ cm$ and height $15 \ cm$ is full of ice cream. The ice cream is to be filled in cones of height $9 \ cm$ and base radius $3 \ cm$, having a hemispherical cap. Find the number of cones needed to empty the container.

 

Answer:

 

The number of cones needed to empty the container $=$