Q. 163.7( 3 Votes )

A classroom is 7 m long, 6 m broad and 3.5 m high. Doors and windows occupy an area of 17 m2. What is the cost of white washing the walls at the rate of Rs. 1.50 per m2.

Answer :


Dimensions of class room = 7m × 6m ×3.5m


Length = 7m, Breadth = 6m , Height = 3.5 m

Area of four walls (including doors & windows) =



Area of walls without doors & windows =

= area including doors & windows – area occupied by doors & windows

Area of only walls = 91 – 17 = 74 m2


Cost of white washing 1 m2 area of walls = Rs.1.50

Total cost of white washing = 74 × 1.50 = Rs.111

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