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Question

Find the dimensions of a rectangle whose length is twice the breadth and whose perimeter is 12 sqm.


A

breadth = 2m

length = 4m

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B

breadth = 2m

length = 9m

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C

breadth = 6m

length = 4m

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D

breadth = 2m

length = 7m

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Solution

The correct option is A

breadth = 2m

length = 4m


Let the breadth be 'x' metres.

then the length is '2x' metres.

Given that the perimeter = 12 sqm.

2(l+b)=12

2(2x+x)=12

2(3x)=12

6x=12

x=126

x=2

breadth = x = 2 m

length = 2x = 4 m.


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