The sum is:

$5 + 10 + 10 + 10 + 20 + 25 = 80$

Would you like more details or have any questions?

Here are five related questions:

1. How do you add a series of numbers quickly?
2. What are the properties of addition?
3. How does grouping numbers help in addition?
4. Can addition be used to solve real-world problems?
5. How does addition work with negative numbers?

Tip: Grouping numbers in pairs or small groups that sum to 10, 20, etc., can make addition quicker and easier.