Question

the floor of a classroom is 10 by 12 metre and its height is 8 M find the area of the four walls and cost of painting at the rate of ₹15 per sq.m
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Answer 1

Answer:

Area of 4 walls =2lh+2bh

=2(b+l)h

⇒Perimeter of floor of wall =2l+2b

⇒2(l+b)=250 m

∴ Area of 4 walls =2(l+b)h

=250h m

2

⇒Cost of painting per m

2

 area = Rs. 10

⇒Cost of painting 250h m

2

 area = Rs(250h×10)

= Rs.2500h

⇒Painting cost of walls = Rs. 15000

⇒2500h=15000

⇒h=

2500

15000

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⇒h=6m

Step-by-step explanation: