The spherical ball of lead 3 cm in diameter is melted and recast into 3 spherical balls. The diameters of two of these are 1 ½ cm and 2 cm respectively. The diameter of third ball is?  Choose the correct answer:	A) 2.66 cm	B) 2.5 cm	C) 3 cm	D) 3.5 cm	E) 4 cm

Rationale: 4 / 3 π * 3 * 3 * 3 = 4 / 3 π [ ( 3 / 2 ) 3 + 23 + r 3 ] r = 1.25 d = 2.5 answer : b
Answer: B