Answer: 15
Explanation:
In order to simplify this expression, we will write it first.
The symbol for pi is
, therefore, we write the expression "pi divided by pi multiplied by 15" as follows:

Now, whenever we divide a number by itself, we get 1 as a result; since pi is a number (an irrational one), the expression can be rewritten as:

Next, any number times 1 is the number itself; our result, therefore, is 15.