The perimeter of a rectangular lawn is 36m. If its length and width increase by 3M, how many square meters will the original lawn area increase?

Let X be the length,
The original area is (18-x) X
Area (21-x) (3 + x) increased by 3M in length and width
The increased area is (21-x) (3 + x) - (18-x) X
=63 (m)

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