1st+3rd ; EVEN number (2)
1st+4th ; EVEN number (4)
1st+5th ; EVEN number (4)
ALL of the original numbers are ODD
ALL of the original numbers are EVEN
something is wrong wrong with the information.
It's a tad difficult to get an odd number
from the sum of two odd numbers or
from the sum of two even numbers.
Your title is correct.
Fractional numbers do not work.