Hey there!

This is very basic mathematics rule that sum of three odd can never be an even number.

But for this question there is a solution.

Take three odd numbers.

9+15+3!

3! is known as 3 factorial.

3! = 3.2.1= 6

When you add them,

9+15+3! = 9+15+6= 30


I hope this answer helps you.

Feel free to ask if you have any more queries.

All the best!