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 54 inches and the width of the wall is 68 inches , what is the length of the wall , in inches ? 
Options: ['a ) 25.7', 'b ) 72.7', 'c ) 70.7', 'd ) 85.7', 'e ) 56.7']
d