Answer:
actual area = 900 square feet
ratio = 1cm2 : 36ft2
Step-by-step explanation:
square room
area = 25cm2
1 side =  √ 25
     =  5cm
1cm = 6ft
5cm = 5 x 6
   = 30ft = 1 side
actual area = 30 x 30 = 900ft
ratio = square cm : square feet
    = 25   :   900  ( simplify both ratio )
   = 1cm2  :  36ft2