Task: Question Answering
Input (English): Problem: two spherical balls lie on the ground touching . if one of the balls has a radius of 6 cm , and the point of contact is 10 cm above the ground , what is the radius of the other ball ( in centimeters ) ? 
Options: a ) 12 , b ) 16 , c ) 20 , d ) 24 , e ) 30
Output (English): e