Question

8. A door of length 2 m and breadth 1m is fitted in a wall. The length of the
wall is 4.5 m and the breadth is 3.6 m (Fig11.6). Find the cost of white
washing the wall, if the rate of white washing the wall is 20 per m.
Fig 11.6​

Answer 1

Answer:

Area of rectangular door=length×breadth=2m×1m=2m

2

Area of wall including door=length×breadth=4.5m×3.6m=16.2m

2

Now, Area of wall excluding door

=Area of wall including door−Area of door

=16.2−2=14.2m

2

Since, The rate of white washing of 1m

2

the wall=Rs. 20

Therefore, the rate of white washing of 14.2m

2

the wall=20×14.2

=Rs. 284

Thus, the cost of white washing the wall excluding the door is Rs. 284.

Answer 2

Answer:

A door of length 2 m and breadth 1m is fitted in a wall. The length of the

wall is 4.5 m and the breadth is 3.6 m (Fig11.6). Find the cost of white

washing the wall, if the rate of white washing the wall is 20 per m.

Fig 11.6