Question

a door of length 4 m and breadth 3 m is fitted in a well. the length of the wall is 16 m and the breadth of the wall is 13m 9 cm. find the cost of white washing the wall at the rate of ₹ 20 per square metre​

Answer 1

Step-by-step explanation:

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.