Question

the length, breadth and height of a hall are 5m ,6m ,7m .the hall has one door of area 1m x 0.5 . find the cost of painting 5he the walls ( only the walls ) at the rate of rupees 90 per square metre

Answer 1

hope yu yuwill understand

Answer 2

Answer:

The cost of painting is Rs. 13815.

Step-by-step explanation:

Given : The length, breadth and height of a hall are 5m ,6m ,7m .The hall has one door of area 1 m x 0.5.

To  find : The cost of painting the the walls (only the walls) at the rate of rupees 90 per square meter.

Solution :

Dimension of the hall,

Length = 5 m

Breadth = 6 m

Height = 7 m

The area covered by hall includes the door is

$CSA=2h(l+b)$

Substitute the value in the formula,

$CSA=2\times 7\times (5+6)$

$CSA=2\times 7\times 11$

$CSA=154m^2$

Dimension of the door is $1m\times 0.5 m$

Area of the door is

$A=l\times b$

$A=1\times 0.5$

$A=0.5 m^2$

The area to be painted not include the door so the remaining area is

Remaining area = Area of hall - Area of door

Remaining area = 154 - 0.5

Remaining area = 153.5 square meter.

We have given,

1 meter square is Rs.90

153.5 meter square is $153.5\times 90=Rs.13815$

Therefore, The cost of painting is Rs. 13815.