In exchange of a square plot one of whose sides is 84 m, a man wants to buy a rectangular plot 144 m long and of the same area as of the square plot. Find the width of the rectangular plot.
Area of square = side2
Area of square = 84 × 84
Area of square = area of rectangle
84× 84 = 144 × width
Width = 
Therefore width of rectangle = 49 m
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