Task: Question Answering
Input (English): Problem: in a class of 70 students , 10 did not opt for math . 5 did not opt for science and 3 did not opt for either . how many students of the class opted for both math and science ? 
Options: a ) 23 , b ) 25 , c ) 27 , d ) 37 , e ) 38
Output (English): e