Task: Question Answering
Input (English): Problem: 13 buckets of water fill a tank when the capacity of each bucket is 42 litres . how many buckets will be needed to fill the same tank , if the capacity of each bucket is 6 litres ? 
Options: a ) 91 , b ) 80 , c ) 96 , d ) 98 , e ) 90
Output (English): a