Probably there are different possible answers for this. I would say 15, because it isn't a Prime number.
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25-1=24 24-2=22 22-3=19 19-4=15 15-5=10 The next number in the series is 10.
19 every other number is a 6 and every number inbetween goes up by 5
Reverse the operations. Start with 19, subtract 4, which leaves 15. Divide 15 by 3, and that is the number you began with.
11
the Answer is 15.. all the numbers are prime numbers and cannot be divided by any number except 1 and the number itself. but the number 15 is divisible by 1, 3, 5 and 15 so the odd number is 15