To find the volume of a right rectangular prism, you can use the formula:
\[ \text{Volume} = \text{Base Area} \times \text{Height} \]
In this case, the base area is given as 20 square units, and the height is 3 units.
Using the formula:
\[ \text{Volume} = 20 , \text{square units} \times 3 , \text{units} = 60 , \text{cubic units} \]
So, the volume of the prism is 60 cubic units.