Solution: The cultivated land area is 0.25 of the forestland area, the forestland area is x square kilometers, and the cultivated land area is 0.25x square kilometers.

x+0.25x= 180

Solve the equation, x= 144, 0.25x=36.

A: The forestland area is 144 square kilometers, and the cultivated land area is 36 square kilometers.

My answer is detailed enough.

I hope the landlord will adopt it.