Question

_+_+_=30
only use 1,3,5,7,9,11,13,15,17

Answer 1

its impossible because all numbers available are odd numbers
and 30 is even..
odd + odd = even, then even + odd = odd

Answer 2

it is impossible bcoz if we add odd times(3,5,7 etc) odd numbers we will never get an even number................