"A classroom is 7m long, 6m broad and 3.5m high.   Doors and windows occupy an area
Channel: Doubtnut
Date: 2020-07-05

"A classroom is 7m long, 6m broad and 3.5m high.
 
  Doors and windows occupy an area of `17\ m^2dot`
 What is the cost of white-washing the walls at
 
  the rate of Rs. `1. 50\ p e r\ m^2dot`"