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 ₹17.50 per m² .

Answer 1

Answer:

555

Step-by-step explanation:

Length, breadth and height of a room are 5 m, 4 m and 3 m.

Area of four walls of the room =2h(l+b)

=2×3(5+4)

=6(9)

=54 sq m

Area of the ceiling =l×b

=5×4

=20 sq cm.

Total area of the four walls and the ceiling of the room

=54+20

=74 sq cm

Cost of white washing = Rs 7.50 per sq m

Total cost of white washing =74×7.50= Rs 555

Answer 2

Answer:

Given dimensions of room are

Step-by-step explanation:

• l= 5 m, b= 4 m h= 3 m Required area for white washing. = Area of the four walls + Area of ceiling. =2( l + b) × h + ( l× b). = 2(5+4)× 3+(5+4) = 2×9×3+20= 54+20= 74 m2. Given, cost of white washing 1 m2 = 7.50 Cost of white washing 74 m2 wall = 7.50× 74 = rupees 555 This is the answer