An open cylindrical vessel of internal diameter 7 cm and height 8cm stands on a horizontal table. Inside this is placed a solid cone , the diametr of whose base is 7/2 cm and height 8cm. Find the volume of water required to fill the vessel. If the cone is replaces by another cone, the radius of whose base is 2 cm and height 7/4 cm, find the drop in the water level.

ans:-847/ cubic cm. and 10/21 cm