Task: Question Answering
Input (English): Problem: a square mirror has exactly half the area of the rectangular wall on which it is hung. if each side of the mirror is 21 inches and the width of the wall is 28 inches, what is the length of the wall, in inches ?
Options: a. 21.5, b. 31.5, c. 41.5, d. 61.5, e. 71.5
Output (English): b