Diameter of the cylinder = 12 cm

=> radius = 6 cm

Height of the cylinder = 15 cm

Diameter of the cone = 6 cm

=>radius = 3 cm

Height of the cone = 12 cm

Radius of the hemisphere = 3 cm

Let the number of cones be ‘n’.

Number of cones = Volume of cylinder/ Volume of ice-cream cone

Therefore, the number of cones required = 10