Task: Question Answering
Input (English): Problem: an employer pays rs . 30 for each day a worker works , and forfeits rs . 5 for each day he is idle . at the end of 60 days , a worker gets rs . 500 . for how many days did the worker remain idle ? 
Options: a ) 52 , b ) 27 , c ) 99 , d ) 61 , e ) 11
Output (English): a