Majority of the candidates found this question rather challenging because they could not manipulate the concept of similar figures to find h, the height of the removed cone i.e. h  =  16 + h  
                                                                                                                                  6         10  
which gives h = 24cm. Very few of them were able to apply the formular for finding the volume of a frustum V =   1/3 π/ h (R2 + Rr + r2), where V = volume of a frustum.