To find the total balance of liabilities, we can use the accounting equation:
\[ \text{Assets} = \text{Liabilities} + \text{Net Worth} \]
We have the following information:
- Total assets = $45,000
- Net worth = $25,000
We need to find the total liabilities. Plugging in the known values, the equation becomes:
\[ 45,000 = \text{Liabilities} + 25,000 \]
To isolate liabilities, we can rearrange the equation:
\[ \text{Liabilities} = 45,000 - 25,000 \]
Calculating that:
\[ \text{Liabilities} = 20,000 \]
Thus, the total balance of liabilities is
\[ \boxed{20,000} \]