Question

_ + _ + _ + =30

1,3,5,7,9,11,13 u can also repeat the numbers..

Answer 1

Odd numbers don't add up to give you an even number.
It is possible only in case of factorial.

3!+1+3+13+7=30 

3!+3!+3!+3!+3!=30

11+1+3+15=30

13+11+3!=30

Answer 2

This is not possible.Because These are odd numbers..An odd number+ another odd number=a even number.
Even number+Odd number=Odd number
30 isn't an odd number

so it is not possible