In a garden there are 10 rows and 12 columns of mango trees. The distance between the two trees is 2 metres adn a distance of one metre is left from all sides of the boundary of the garden. The length of the garden is
A. 20 m
B. 22 m
C. 24 m
D. 26 m

• Each row contains 12 plants.
  
  There are 11 gapes between the two corner trees (11 x 2) metres and 1 metre on each side is left.
  
  Therefore Length = (22 + 2) m = 24 m.
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