Math, asked by mumairuddin8b4, 21 days ago

The cost of whitewashing the four walls of a room of dimensions length =7 m, breadth =6 m and height =5 m at the rate of Rs 100m^(2) is:

Answers

Answered by bhuvansainath16
0

Answer:

Step-by-step explanation:

Area to be whitewashed = area of four walls + area of ceiling

Formulas to be noted :−

Area of four walls =2 ( length + breadth ) × height

Area of ceiling = area of rectangle = length × breadth

In the question, length of the room =6m

breadth of the room =4.5m  

height of the room =3m

On the basis of formulas given above :−

Area of four walls =2(6m+4.5m)x3m

Area of four walls =2(10.5m)x3m

Area of four walls =21mx3m

Area of four walls =63m  

2

 

Area of ceiling =6m×4.5m

Area of ceiling =27m  

2

 

Therefore, area to be whitewashed =63m  

2

+27m  

2

 

Area to be whitewashed =90m  

2

 

Cost of whitewashing = rate at which area is being whitewashed × area to be whitewashed  

Cost of whitewashing =Rs8/m  

2

×90m  

2

 

Cost of whitewashing =Rs8×90

Cost of whitewashing =Rs.720.

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