Question

The length, breadth and height of a hall are 5 m, 6 m, and 7m respectively. The hall has one door of area 1 m x 0.5 m. Find the cost of painting the walls (only walls) at the rate of rs 90 per square metre.. plz help

Answer 1

the formula of for four walls=2 (l+b)×h
=2 (5+6)7
=2 (11)7
=154
=154-1×0.5

=153.5
cost of painting=153.5×90=13815

Answer 2

Step-by-step explanation:

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

Substitute the value in the formula,

Dimension of the door is

Area of the door is

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

Therefore, The cost of painting is Rs. 13815.