Question

A classroom is 12m long, 9 m wide and 5m high. Find the area of its four walls.Also find the cost of whitewashing the walls of classroom at the rate of Rs.25 per m^2


plz solve step by step​

Answer 1

Answer:

cant solve

Step-by-step explanation:

see from you tube

Answer 2

Answer:

5450

Step-by-step explanation:

area of four walls=2×(l+b)×h

=2×(12m+9m)×5m

=2×21m×5m

=42m×5m

=210m^2

Total cost of whitewashing the four walls=

area of four walls×at the rate of painting per m^2

=210m^2×Rs.25

=Rs.5450