Task: Question Answering
Input (English): Problem: in an intercollegiate competition that lasted for 3 days , 185 students took part on day 1 , 150 on day 2 and 200 on day 3 . if 100 took part on day 1 and day 2 and 110 took part on day 2 and day 3 and 50 took part on all three days , how many students took part only on day 3 ? 
Options: a ) 45 , b ) 35 , c ) 55 , d ) 30 , e ) 40
Output (English): e