Arithmetic - In a rectangle length = twice that of breadth , cost of grounding is 60 rupees per meter, Total cost

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In a rectangle length = twice that of breadth , cost of grounding is 60 rupees per meter, Total cost is 3600/- what is the length in meter?

Total Answers and Comments: 4

Last Update: August 27, 2005

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August 04, 2005 06:49:26

Srinivas murthy

RE: In a rectangle length = twice that of breadth , cost of grounding is 60 rupees per meter, Total cost...

Total cost 3600
cost per sq meter 60
Area of rectangle 3600/60 60 sq meter

Let
length L
Bredth B

Area of rectangle 2*(lenght * bredth)

Area 2(B * 2B) 60
6B 60
B 60/6
B 10

L 2B
L 20

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August 04, 2005 13:14:39

veeru

RE: In a rectangle length = twice that of breadth , cost of grounding is 60 rupees per meter, Total cost...

The solution to the question is wrong

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August 04, 2005 13:38:17

Shanker

RE: In a rectangle length = twice that of breadth , cost of grounding is 60 rupees per meter, Total cost...

Hello Veeru Why don't you post the answer and explanation why it's wrong insted of just saying wrong.

Thanks Shanker

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August 27, 2005 14:53:21

Rakesh verma

RE: In a rectangle length = twice that of breadth , cost of grounding is 60 rupees per meter, Total cost...

solution provided above is wrong b'coz AREA of a rectangle is not 2*(lenght * bredth)

but is (Length * Bredth)

ya perimeter of rectangle is truly
2*(length + bredth)

now have a look at question again
.... cost of grounding is 60 rupees per meter....

now it is clear that cost given to us is in meter and not in meter square
so tell me why we will calculate AREA.

it is obvious that we have to use its perimeter
so now solution will look like this

Total cost 3600
cost per sq meter 60
Area of rectangle 3600/60 60 sq meter

Let
length L
Bredth B

given that L 2B

Perimeter of rectangle 2*(lenght + bredth)

Area 2(2B + B) 60
6B 60
B 60/6
B 10

L 2B
L 20

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