Task: Question Answering
Input (English): Problem: the h . c . f . of two numbers is 15 and their l . c . m . is 420 . if one of the numbers is 375 , then the other is : 
Options: a ) 12.21 , b ) 283 , c ) 16.8 , d ) 318 , e ) 32.4
Output (English): c