Question

the Length breadth and height of a room are 5m 4m and 3m respectively find the cost of whitewashing the walls of the room and the ceiling at the rate of rupees 7.50 per metre square​

Answer 1

Answer:

555 rupees

Step-by-step explanation:

2bh+2lh+lb

use this formula then multiply it by 7.50

Answer 2

☆Answer ☆

Given :-

Length of the room = 5m

Breadth of the room = 4m

Height of the room = 3m

Area to be white washed = Area of walls + Area of ceiling

Total surface area of a cubiod = 2(lh + bh + lh)

=2×(5+4)×3+5×4

            =2×9×3+20

             =54+20

                =74

cost of white washing 1m=rs 7.5

cost of 74m=7.5×74=rs555

☆Brianly Extra Knowledge ☆

Formulae :-

• Total surface area of a cubiod = 2(lh + bh + lh)