Question

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

Answer 1

Answer:

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

Expert Answer:

Area to be whitewashed does not include the floor.

Therefore, area to be whitewashed

= Area of four walls + area of the ceiling

= 2 (l + b) h + l b

= [2 (5 + 4) 3 + 5 4] m

=54 + 20 m2

= 74 m2

Cost of white washing = Rs 7.50 74 = Rs 555

Answer 2

✌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 Rs 7.50 per sq m.

✌ANSWER

➡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

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