Let's evaluate the two columns.
Column A: \[ 0.5 + 34 = 34.5 \]
Column B: \[ 3 - \sqrt{25} = 3 - 5 = -2 \]
Now, let's examine the results:
- Column A: \( 34.5 \) is a rational number.
- Column B: \( -2 \) is also a rational number.
Both columns have rational sums. Therefore, the correct statement is: Statement #3: Column A and Column B both have rational sums.
The answer is Statement #3.