Answer :


Given, length of the lawn = 72 m


Breadth of the lawn = 18 m


We know that, perimeter of rectangle = 2 × (l + b)


So, perimeter of the lawn = 2 × (72 + 18) = 2 × 90 = 180 m


i.e. Length of hedge boundary = 180 m


No. of shrubs to be planted in 1 m of hedge = 3


No. of shrubs to be planted in 18 0m of hedge = 3 × 180 = 540


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