Please explain to me how to do this following exercise:

The following table contains data on aggregate demand and aggregate supply for a hypothetical economy ($mil).

Price Level Real GDP demanded Real GDP supplied

75 440 360

80 430 370

100 400 400

120 380 420

150 360 440

What are the equilibrium output (RGDP)?

Hint: The answer is a number

Also I would like to know the difference and the meaning of a Long run situation and a short run situation

And last question whats the concept of the - Equilibrium Output and the Price Lvl-

Thank you