3.4: 20.4

It appears you might be trying to perform a subtraction or division with the numbers you've provided (3.4 and 20.4). Here are the results for both potential operations:

1. Subtraction:

   • \( 20.4 - 3.4 = 17.0 \)

2. Division:

   • \( \frac{20.4}{3.4} \approx 6.00 \)

If you meant something else or need further assistance, please clarify!