The area of a rectangular hallway is 120 square feet. If the length and width are both composite numbers, wht are the possible dimensions of the hallway?

120 = 2^3*3*5
There are 5 total factors. At least 2 are needed to form a composite number. Possibilities are
  2*2 by 2*3*5 ›› 4 ft by 30 ft
  2*3 by 2*2*5 ›› 6 ft by 20 ft
  2*5 by 2*2*3 ›› 10 ft by 12 ft
  3*5 by 2*2*2 ›› 15 ft by 8 ft