What is a sum of 21 and difference of 5?

To find the sum of 21 and the difference of 5, we first need to determine what the two numbers are. Let's call the larger number x and the smaller number y. We know that x + y = 21 and x - y = 5. By solving these two equations simultaneously, we can determine that the numbers are 13 and 8. Therefore, the sum of 21 and the difference of 5 is 21 + 5 = 26.