In exchange of a square plot one of whose sides is 84m, a man wants to buy a rectangular plot 144 m long and of the same areas of the square plot. Find   the width of the rectangular plot.

Explanation

Side of the square plot `= 84 m`
Now, the man wants to exchange it with a rectangular plot of the same area with length '144'.
Area of the square plot
`= 84 xx 84 = 7056 m^2`
Area of the rectangular plot = Length` xx Width`
`7056=144xxwidth`
`width=49m`.