Task: Question Answering
Input (English): Problem: two family reunions are happening at the park avenue hotel , the oates reunion and the hall reunion . all 100 guests at the hotel attend at least one of the reunions . if 40 people attend the oates reunion and 70 people attend the hall reunion , how many people attend both reunions 
Options: a ) 2 , b ) 5 , c ) 10 , d ) 16 , e ) 22
Output (English): c