Diameter of sphere = 21 cm
Radius = 21/2 cm
Height of the cone = 3 cm
Radius of the cone = 7/4 cm
Volume of the sphere = 4/3 πr3 = 4/3 x π x (21/2)3 cm3
Volume of cone = 1/3 πr2 h = 1/3 π (7/4)2 x 3 cm3
Let n be the number of cone formed, then
n = (Volume of the sphere) / (Volume of cone)
n = (4/3 x π x (21/2)3) / (1/3 π (7/4)2 x 3)
= 504
Number of cones formed = 504