500m of fencing is available to make 4 rectangular pens of identical shape. Find the dimensions that maximise the area of each pen if the plan is: (DIAGRAMS BELLOW)

Answer:
The answer is "[tex]x(\frac{250}{3}-x)[/tex]"
Step-by-step explanation:
Both points are similar that's why the solution is:
[tex]\to \frac{6x+6y=500}{6}\\\\\to x+y=\frac{250}{3}\\\\\to y= \frac{250}{3}-x \\\\\to Area= xy\\\\ \to Area= x(\frac{250}{3}-x)[/tex]