To find the total number of newspapers Mason delivers in a month, we can set up the following equation:
Let \( n \) be the total number of newspapers delivered in a month.
Mason delivers 30 newspapers each day for 20 days. Therefore, we can express this as:
\[ n = 30 \text{ newspapers/day} \times 20 \text{ days} \]
Now, let's calculate \( n \):
\[ n = 30 \times 20 \]
\[ n = 600 \]
Thus, the total number of newspapers Mason delivers in a month is \( \boxed{600} \).