A conical vessel 11cm high having a top of 50mm

Question

A conical vessel 11cm high having a top of 50mm diameter is filled completely to its rin with water some spherical pellets each of 5mm diameter are dropped into the vessel and then 2/5 of the water overflow how many lead pellets were dropped into the vessel? 

Answer 1

V_cone = (1/3)πr²h

V_cone = (1/3)π(25²)(11)

 

V_pellet = (4/3)πr³

V_pellet = (4/3)π(2.5³)

 

(2/5)(V_cone) / V_pellet = number of pellets