the product of twenty-five and the sum of a number and four

25(n + 4)

To find the product of twenty-five and the sum of a number and four, you need to follow a simple mathematical expression.

Let's break it down step by step:

1. Consider a variable to represent the unknown number. Let's call it "x".
2. The sum of a number and four is written as "x + 4".
3. Multiply twenty-five by the sum "x + 4".

So, the mathematical expression becomes:

25 * (x + 4)

Now, depending on the value you assign to variable "x," you can evaluate this expression to find the final answer.