Ahallway has an area of 63 square feet. the length of the hallway is 7 times longer than the width. what is the width of the hallway?

The area is given by:
 A = (w) * (l)
 Where,
 w: width
 l: length
 Substituting values we have:
 63 = (w) * (7w)
 Clearing w we have:
 w ^ 2 = 63/7
 w = root (9)
 w = 3 feet
 
 the width of the hallway is:
 w = 3 feet