The sum of $5 + 10 + 5 + 10 + 25$ is:

$5 + 10 + 5 + 10 + 25 = 55$

The answer is 55.

Would you like a breakdown of the addition or have further questions?

Here are some related questions you might find interesting:

1. What is the sum of $5 + 10 + 15 + 20 + 25$?
2. How can I add multiple numbers quickly in my head?
3. What is the average of $5, 10, 5, 10,$ and $25$?
4. How do you determine the sum of an arithmetic sequence?
5. How can I verify the accuracy of my addition?

Tip: Breaking down addition by grouping similar numbers can make mental math faster and easier.