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| Question: 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?
Answer: 20 |
| August 08, 2005 14:53:21 |
#4 |
| Rakesh verma |
Member Since: Visitor Total Comments: N/A |
RE: In a rectangle length = twice that of breadth , cost of gr
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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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