Question

The length ,breadth and height of a room are 7m,5m and 3m respectively .Find the cost of painting the four walls and ceiling of the room at ₹10 per sq m.

Sunu answer it

Answer 1

Answer:

Cost= Rs 1070

Step-by-step explanation:

Length=7m                Breadth=5m                 Height=3m

Area= 2(l+b)h+lb = 2(7+5)*3+7*5

                             = 2*12*3+35 = 72+35= 107m2 (meter square)

Total cost= 107*10

                = 1070 Rs

Answer 2

Answer:Rs. 1070

Step-by-step explanation:

L =7m

b=5m

h=3m

Area of walls and ceiling =

lateral Surface area of cuboid + area of rectangle

=2 (bh + hl) + lb

=2×(5×3+3×7) + 7×5

=2×(15+21) + 35

=2× 36+35

=72+35

=107

Cost= area to be painted + rate per sq. n

=107 × 10

= Rs. 1070