Task: Question Answering
Input (English): Problem: an alloy of zinc and copper contains the metals in the ratio 5 : 3 . the quantity of zinc to be added to 6 kg of the alloy so that the ratio of the metal may be 3 : 1 is : 
Options: a ) 2 , b ) 9 , c ) 8 , d ) 7 , e ) 4
Output (English): c