Question:In a garden ,there are `10` rows and `12` columns of mango trees .The distance between two trees is `2`metres and a distance of one metre is left from all sides of the boundary of the garden. The lengh  of the garden is . 

A `20 m` 
B `22 m` 
C `24 m` 
D `26 m` 

+ Answer
B 

+ Explanation
Each row contains `12` plants. ,Leaving `2` corner plants ,`10` plans in between have `(10 xx 2) metres & `1` metre on each side is left .

:.Length `= (20 + 2) m = 22 m.

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Irin Moni

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