Task: Question Answering
Input (English): Problem: a tailor trims 7 feet from opposite edges of a square piece of cloth , and 5 feet from the other two edges . if 45 square feet of cloth remain , what was the length of a side of the original piece of cloth ? 
Options: a ) 13 , b ) 15 , c ) 17 , d ) 19 , e ) 21
Output (English): d