Question

4 (x - 2 )metres of rock is used to fence the rectangular enclosure shown in the figure. find x.

Answer 1

First find the dimensions of the rectangle.
length x width = area
25 x width = 225
divide each side by 25
width = 225/25 = 9
The garden is 9m by 25m

this makes its perimeter 9 + 25 + 9 + 25 = 68m
4(x-2) = 68
4x -8 = 68
add 8 to each side
4x = 76
divide by 4
x = 19m
checking 4(19-2) = 4(17) = 68