The cost of carpeting a room 18 m long with a carpet 75 cm wide at Rs.4.50 per metre is Rs.810.
The breadth of the room is :
a) 7 m b) 7.5 m c) 8 m
d) 8.5 m e) None of these

• Length of the carpet =(Total cost of carpeting/Rate per m carpet)
  
  =(8100/45)m=180m
  As the carpet covers the whole room.
  
  So, Area of the room = Area of the carpet
  
  =(180×75/100)square m=135 sq m
  
  ∴ Breadth of the room =(Area/Length)=(135/18)m
  
  = 7.5 m
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