It is impossible
Let x, y, z be 3 required odd numbers
Odd no. +odd no. =even no.
z+even no. =30 (which is even no.)
z+even no. =even no.
z=even no. - even no.
So, z=even no...
But.... Z is odd no.
Hence, sum of 3 odd numbers can never be 30 or any even number.