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 the correct choice.
A) 2.6 B) 2.5 C) 2.9 D) 3.5 E) 7.5
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?