Question

the length, breadth and height of a room are 5m 4m and 3m respectively.find the cost of white washing the Wall of the room and the ceiling at the rate of ₹7.50 per metre square​

Answer 1

Answer:

l=5m

b=4m

h=3m

lsa+l*b=2*(l+b)*h+l*b

           =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

Answer 2

Answer:

l=5m,b=4m,h=3m

lsa+l*b=2*(l+b)*h+l*b

=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

hope help u mate ✌