Question

A door of length 2 m and breadth 1 m is fitted in a wall. The length of the wall is 4.5 m

and the breadth is 3.6 m (Fig). Find the cost of white washing the wall, if the rate of white

washing the wall is ₹ 20 per m2

.

The Length and the breadth of a rectangular piece of land are 500 m and 300 m,

respectively. Find

(i) Its area
( 2) the cost of the land, if 1 m2 of the land costs ₹ 10,000.​

Answer 1

Answer:

Solution:

Length of wall= 4.5m

Breadth of the wall= 3.6m

Length of the door =2m

Breadth of the door= 1m

Area of the wall = l\times b=4.5m\times3.6m=\ 16.20m^2l×b=4.5m×3.6m= 16.20m

2

Area of the door = l\times b=2m\times1m=2m^2l×b=2m×1m=2m

2

Therefore area of the wall to be white washed= Area of the wall - Area of the door

=Rs\ 14.20\times20=Rs\ 284.00=Rs 14.20×20=Rs 284.00

Hence, the required area= 14.20m^214.20m

2

and the required cost= Rs 284