23 is an odd number between 10 and 30 that gives a remainder of 2 when divided by 7.
Ten
10.
20 is between 10 and 30.
21 23 25 27 29
23 is an odd number between 10 and 30 that gives a remainder of 2 when divided by 7.
10
30
Ten
A number that has exactly an odd number of factors is a power of another number. A number between 10 and 30 that is a power is 16. It is 24 (as well as 42) and its factors are 1, 2, 4, 8, and 16.
That number is 36.
10.
20 is between 10 and 30.
15
Even number.
The sum of 3 odd numbers is odd while 30 is an even number. So there is not a valid answer in the normal sense. However, in base 9, 5 + 6 + 17 = 30 [In base 10, the above is 5 + 6 + 16 = 27]
10, 30, 50, 70, 90