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 m^{2}. What is the cost of white washing the walls at the rate of Rs. 1.50 per m^{2}.

Answer :

Given,

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

Where,

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

Area of four walls (including doors & windows) =

=

Then,

Area of walls without doors & windows =

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

Area of only walls = 91 – 17 = 74 m^{2}

So,

Cost of white washing 1 m^{2} area of walls = Rs.1.50

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

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PREVIOUSA cuboid has total surface area of 50 m2 and lateral surface area os 30 m2. Find the area of its base.NEXTThe central hall of a school is 80 m long and 8 m high. It has 10 doors each of size 3 m ×1.5 m and 10 windows each of size 1.5 m× 1 m. If the cost od white washing the walls of the hall at the rate of Rs. 1.20 per m2 is Rs. 2385.60, find the breadth of the hall.

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