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
*7.50 per m²​

Answer 1

Answer:Area of the room= 5x4x3

= 60m square

Cost of white washing the walls of the room and the ceiling at the rate of Rs7.50 per m sq = 7.50x 60 = Rs 450

Hope it helps you buddy

Answer 2

$\bigstar$ Given:

• Length of the room = 5 m
• Breadth of the room = 4 m
• Height of the room = 3 m
• Cost of white washing the walls of the room and the ceiling per metre = 7.50 m²

$\bigstar$ To Find:

• Cost of white washing the walls of the room and the ceiling at the rate of  7.50 per m²​

$\bigstar$ Solution:

It can be observed that four walls and the ceiling of the room are to be white washed.

Total area to be white washed = Area of walls + Area of ceiling of room

$\implies 2lh + 2bh + lb$

$\implies (2 \times 5 \times 3 + 2 \times 4 \times 3 + 5 \times 4)$

$\implies (30 + 24 + 20)$

$\implies 74$

Area = 74 m²​

Therefore,

∴ Cost of white wash per m²​ area = Rs.7.50 (Given)

Cost of white washing 74 m² area = Rs. (74 × 7.50)

$:\implies \boxed{\underline{\underline{Rs. \: 555}}}$

Thus, the cost of white washing the walls of the room and the ceiling is Rs. 555