Three times a a number n can be written "3n". If n equals the number 5, then what does 3n equal?

15 When a number is exactly beside a letter it means multiply. So if the letter (n) gets replaced by a number (5) it still means multiply.

3 times 5 equals 15

To find what 3n equals, we need to substitute the value of n into the equation 3n. In this case, n is equal to 5.

So, we substitute n with 5 in the equation 3n:
3n = 3 * 5

Now, let's calculate the expression:
3n = 3 * 5 = 15

Therefore, when n equals 5, the value of 3n is 15.