Task: Question Answering
Input (English): Problem: in a class , 6 students can speak gujarati , 15 can speak hindi and 6 can speak marathi . if two students can speak two languages and one student can speak all the 3 languages , then how many students are there in the class 
Options: a ) 21 , b ) 22 , c ) 23 , d ) 24 , e ) 25
Output (English): b