Answer:
The value of x is 60 ft.
Step-by-step explanation:
The area of a rectangle is

The area of school is

The area of old lot with school is

The area of old lot without school is

The area of new lot with school is

The area of old lot without school is

It is given that the area of new parking lot will be twice the size of the old parking lot.





The value of x can not be negative. Therefore the value of x is 60 ft.