Task: Question Answering
Input (English): Problem: 20 buckets of water fill a tank when the capacity of each bucket is 13.5 litres . how many buckets will be required to fill the same tank if the capacity of each bucket is 9 litres ? 
Options: a ) 30 , b ) 32 , c ) 60 , d ) data inadequate , e ) none of these
Output (English): a