Let's solve the expression step by step:

1. First, calculate the value inside the parentheses:
   $15 - 10 = 5$

2. Now substitute this value back into the expression:
   $6 + 5$

3. Add:
   $6 + 5 = 11$

4. Multiply the result by 5:
   $11 \cdot 5 = 55$

So, the value of the expression is 55.

Would you like more details or have any questions?

Here are 5 related questions to explore:

1. What happens if you change the parentheses to $6 + (15 - 5) \cdot 5$?
2. How do you handle an expression with multiple parentheses like $[6 + (15 - 10)] \cdot 5 \cdot (2 + 3)$?
3. Can you solve $6 + (2 \cdot 3) - 5$?
4. How would the answer change if you replaced 5 with another number, say 7?
5. What is the general rule for the order of operations in expressions like this?

Tip: Always remember to follow the order of operations (PEMDAS: Parentheses, Exponents, Multiplication and Division, Addition and Subtraction) to solve expressions correctly.