Question:The ratio between the length and breadth of a rectangular field is 5 : 4. If the breadth is 20 m less than the length, the perimeter of the field is : 

A `260 m` 
B `280 m` 
C `360 m` 
D None 

+ Answer
C 

+ Explanation
Let length = 5x and breadth = 4x in mertres. Then,

`5x - 4x = 20 =>x = 20`

:. Length` = 100 m & Breadth = 80 m.`

:. Perimeter` = 2 (100 + 80) m = 360 m.`

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Irin Moni

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