_+_+_=30 (only use this numbers 1,3,5,7,9,11,13,15 )

Question

You can also repeat the numbers

Answer 1

If 15, then two numbers that sum to 15, none present

If 13, then two numbers that sum to 17, none present

If 11, then two numbers that sum to 19, none present

 

Get the idea?