Task: Question Answering
Input (English): Problem: in a classroom , the average age of boys ( b ) is g and the average age of girls ( g ) is b . the average age of all is b + g . at the time of calculation , the class teacher , who is 42 years old was also present in the class . can you find the value of b + g ? 
Options: a ) 8 , b ) 3 , c ) 7 , d ) 9 , e ) 10
Output (English): a