Question

The length, breadth and height of a room are 5 m, 4 m and 3 m respectively. Find the
cost of white washing the walls of the room and the ceiling at the rate of
₹7.50 per m²​

Answer 1

Answer:

Step-by-step explanation:

Given:

The length, breadth, and height of a room are 5 m, 4 m, and 3 m respectively.

To Find:

The cost of whitewashing the walls of the room and the ceiling at the rate of Rs. 7.50 per m^2.

Solution:

Length = 5m

breadth = 4m

height = 3m

lateral surface area + length × breadth

=2 × ( l + b ) × h + l × b

=2 × (5+4) × 3 + 5 × 4

=2 × 9 × 3 + 20

       

=54 + 20

             

=74m^2

Now Cost of whitewashing 1m = Rs 7.5

Cost of 74m= 7.5 × 74 = Rs 555.

Hence the cost of white washing the walls of the room and the ceiling at the rate of Rs. 7.50 per m^2 is Rs 555.

Answer 2

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