Here is a frustum of a cone. The frustum is made by removing a small cone from a similar large cone. 15 cm 6 cm x cm Diagram NOT accurately drawn The height of the large cone is 15 cm. The radius of the base of the large cone is 6 cm. The radius of the base of the small cone is x cm. Given that the volume of the frustum is 4212 25 π cm3 work out the value of x Show clear algebraic working