Task: Question Answering
Input (English): Problem: mrs . evans gave a test to her freshmen economics class , which has 50 students enrolled and 25 of them answered question 1 correctly . if 20 answered question 2 correctly and 20 did not take the test then how many answered both questions correctly ? 
Options: a ) 23 , b ) 22 , c ) 21 , d ) 20 , e ) 19
Output (English): d