1.

find the height of the room in which perimeter of its base is 60meter and area of 4 walls is 240 meter square

Answer»

It is given that length, breadth and HEIGHT of a room are 8 m, 5 m and 3 m respectively.

AREA of four walls of the room is: 2h(l+b)

A=2h(l+b)=2×3(8+5)=6×13=78 m

2

Area of the ceiling is:

A=l×b=8×5=40 m

2

Total area of the four walls and the ceiling of the room is 78+40=118 m

2

It is given that COST of white washing is Rs.15/m

2

, THEREFORE,

Total cost of white washing is:

118×15=1770

Hence, the cost of white washing the walls is Rs.1770.


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