a classroom 7m long ,6m broad and 3.5 M high in which doors and windows occupy an area of 17 m square. what is the cost of whitewashing the wall at Rs 1.50 per metre
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Answer:
Your answer is Rs 111
Step-by-step explanation:
Area of four walls = 2( l+ b ) h
= 2 ( 7+6) 3.5
= 2 × 13 × 3.5
= 81 m^2
Area of four walls without doors and windows = Area of four walls - Area of doors and windows
= 91 - 17 = 74 m^2
Cost of white washing 1 m^2 area of walls = Rs 1.50
Total cost of whitewashing = 74 × 1.50
= Rs 111
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