Task: Question Answering
Input (English): Problem: 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 ? 
Options: a ) 2.8 , b ) 2.5 , c ) 2.2 , d ) 2.0 , e ) 2.1
Output (English): b