To solve the expression:

$400 - (26 + 21 - 11)$

First, simplify the expression inside the parentheses:

$26 + 21 = 47$ $47 - 11 = 36$

Now substitute this result back into the original expression:

$400 - 36 = 364$

So, the result is:

$\boxed{364}$

Would you like more details or have any questions?

Here are 5 related questions to explore further:

1. What is the value of $500 - (30 + 25 - 15)$?
2. Can you simplify $600 - (45 + 35 - 20)$?
3. How would you solve $300 - (15 + 10 - 5)$?
4. What is $800 - (60 + 40 - 30)$?
5. Can you compute $1,000 - (50 + 40 - 20)$?

Tip: When solving problems with parentheses, always simplify the inner expression first before performing any operations outside of the parentheses.