Task: Question Answering
Input (English): Problem: a room is 7 meters 20 centimeters in length and 4 meters 32 centimeters in width . find the least number of square tiles of equal size required to cover the entire floor of the room . 
Options: a ) 10 , b ) 15 , c ) 17 , d ) 19 , e ) 21
Output (English): b