Question

a door of length 2 metre and breadth 1m is fitted in a wall. the length of the wall is 4.5m and the breadth is 3.6m. find the cost of whitewashing the wall, if the rate of white washing the wall is 20 per square metre.​

Answer 1

Answer:

area of the door= 2m*1m=2m²

area of the wall=4.5m*3.6m=16.2m²

area of the wall for white washing= 16.2m²-2m²= 14.2m²

cost of whitewashing 1m²=rs20

cost of whitewashing the wall= 14.2*20=rs284

Step-by-step explanation:

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Answer 2

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Area of rectangular door=length×breadth=2m×1m=2m2

Area of wall including door=length×breadth=4.5m×3.6m=16.2m2

Now, Area of wall excluding door

=Area of wall including door−Area of door

=16.2−2=14.2m2

Since, The rate of white washing of 1m2 the wall=Rs. 20

Therefore, the rate of white washing of 14.2m2 the wall=20×14.2

= Rs. 284

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

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