Question

.
A door of length 2 m and breadth Imis 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 Rs 20 per m².​

Answer 1

Correct 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. Find the cost of White Washing the wall , if the rate of white washing the wall is Rs 20 per m².

Given :

⬤ Length of Door is = 2 m

⬤ Breadth of Door is = 1 m

⬤ Length of Wall = 4.5 m

⬤ Breadth of Wall = 3.6 m

To Find :

⬤ Cost of White Washing the Wall at the rate of Rs. 20 per m² .

Solution :

$\sf[\:{Area\:of\:Wall=l\times{b}\:]}$

= 4.5 × 3.6

= 16.20 m²

$\sf[\:{Area\:of\:Door=l\times{b}\:]}$

= 2 × 1

= 2 m²

Now :

Area of White Washing the Wall = 16.20 - 2

= 14.20 m²

Hence ,

Cost of White Washing in 1m² is = Rs. 20

Cost of White Washing in 14.20m² is = 20 × 14.20

= Rs. 284

Therefore , Cost of White Washing the Wall at the rate of Rs. 20 per m² is Rs. 284 .

═════════════════════════

Related Formulas :

• Perimeter of Rectangle = 2(l + b)
• Area of Rectangle = l × b
• Perimeter of Square = 4 × Side
• Area of Square = Side × Side
• Area of Triangle = 1/2 × b × h

═════════════════════════

Answer 2

Step-by-step explanation:

Dimensions of the door..

Length =2 m

Breadth =1 m

Area of the door =2*1 =2 m²

Dimensions of the wall...

Length =4.5 m

Breadth =3.6 m

Area of the wall =4.5*3.6=16.2 m²

Area for white washing =area of the wall- area of the door

=) 16.2-2=14.2 m²

Given cost per m²=20 rs

Cost of white washing =14.2*20=284 rs

This is your answer...

Hope it helps you...