6...they are 39-41-43-45-47 and 49
50
50
50 of them.
25.
10.
25
half of (50 - 20)
The ratio of odd numbers to even numbers is 1 : 1 or 50-50.
450... There are 500 odd numbers from 000 to 999 inclusive. From 000 to 099, there are 50 odd numbers. 500 - 50 = 450.
50
25
50