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 1/2 cm and 2 cm respectively. The diameter of third ball is?
Choose one:  A) 2.8  B) 2.5  C) 2.2  D) 2.0  E) 2.1
4/3 π * 3 * 3 * 3 = 4/3 π[(3/2)3 + 23 + r3]   r = 1.25   d = 2.5   Answer:2.5
<result>B</result>
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 1/2 cm and 2 cm respectively. The diameter of third ball is?