Question

A classroom is 12 m long, 9 m wide and 5 m high. Find the area of its four walls. Also, find the cost of whitewashing the walls of the classroom at the rate of 25 per m. (Ignore the doors, windows and other openings.)

Answer 1

Answer:

Area of four walls=210m^2

price will be =₹5250 or ₹131250

Step-by-step explanation:

Length=12m

breadth=9m

height= 5m

Area of four walls =leteral surface area=2(lh+bh)

=2(12*5+9*5)

=2(60+45)

=2(105)

=210m^2

if in question the price is given per meter square

Area of four walls=210m^2

rate of white washing per m^2=₹25

cost of white washing is =210*25

=₹5250

And if it is given per meter

then answer will be

the rate per m=25

therefore rate per meter square is =25^2=625

so cost for white washing will be =210*625

=₹131250

Answer 2

Answer:

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