Task: Question Answering
Input (English): Problem: p can do a work in the same time in which q and r together can do it . if p and q work together , the work can be completed in 10 days . r alone needs 35 days to complete the same work . then q alone can do it in 
Options: a ) 20 , b ) 22 , c ) 25 , d ) 28 , e ) 30
Output (English): d