a cylindrical vessel of radius 4cm contains water. a solid sphere of radius 3cm is lowered into the water until it is completely immensed. the water level in the vessel will rise by ?
the diameters of the top and the bottom portions of a bucket are 42cm and 28cm.respectively, if the height of the bucket is 24cm, then the cost of painting its outer surface @ of 50paise/cm square is ?