The odd one out of those numbers is 7.
23 25 27 29 31 33 35 37
35 is not divisible by 2, making it an odd number.
35 is an odd composite number
21 23 25 27 29 31 33 35 37 39
-23
Since 5 is odd, any whole number ending in 5 will also be odd (including 35).
The sum (done on a spreadsheet) of 1 to 35 as odd numbers is 1225.
23 * 35 = 805
23+35=58
The odd numbers between 30 and 40 are: 31 33 35 37 39
35
The answer is 35.