To find the volume of a right rectangular prism, you can use the formula:
\[ \text{Volume} = \text{Base Area} \times \text{Height} \]
We are given that the area of the base is \(20\) square units and the height is \(3\) units. Now we can substitute these values into the formula:
\[ \text{Volume} = 20 , \text{square units} \times 3 , \text{units} \]
Calculating this gives:
\[ \text{Volume} = 60 , \text{cubic units} \]
Thus, the volume of the right rectangular prism is \(60\) cubic units.