Task: Question Answering
Input (English): Problem: a tailor trims 6 feet from opposite edges of a square piece of cloth , and 5 feet from the other two edges . if 80 square feet of cloth remain , what was the length of a side of the original piece of cloth ? 
Options: a ) 16 , b ) 18 , c ) 20 , d ) 24 , e ) 32
Output (English): c