Question

A door of lengths 2m and breadth 1m and a window of length 1m and breadth 0.5m are fitted in a wall 4.5 m in length and 4m in breadth. Find the cost of washing the wall at the rate of rs 20 per m²​

Answer 1

Answer:

Step-1: Finding the area for calculating the cost

From the given values,

Area of the wall including the door =length×breadth

=4.5×3.6=16.2m

2

Area of the door =2×1=2m

2

Area of wall excluding door =16.2−2=14.2m

2

Step-2: Finding the cost of white washing

The rate of white washing 1m

2

of the wall is Rs.20

The rate of white washing 14.2m

2

of the wall is =20×14.2=Rs.284

Hence , the rate of white washing the wall excluding the door is Rs.284.

Answer 2

Step-by-step explanation:

Area of the wall including the door

= lengthxbreadth

= 4.5x3.6-16.2m

= 4.5x3.6-16.2m

Area of the door =2×1

=2m

Area of wall excluding door

=16.2-2

=14.2m

Finding the cost of white washing the rate of white washing 1m

of the wall is Rs.20

The rate of white washing 14.2m

of the wall is

=20×14.2=Rs.284

Ans.= Rs.284