What is 15 + 15?

15 + 15 is a simple addition problem in mathematics. When you add 15 and 15 together, the result is 30. The symbol "+" represents addition, and the numbers being added are called addends. In this case, both addends are 15. Addition is the mathematical operation of combining two or more numbers to find a total or sum. Adding 15 and 15 demonstrates the commutative property of addition, which means the order of the addends does not affect the final sum.