it's 5
9,000 of them are
49
12
99
There are 30 whole numbers that are odd numbers less than 60 which are also positive. Otherwise, there are infinitely many of them.
99000
42
There are 17 of them
There are infinitely many whole numbers which are less than 20. Start with 19 and go back, beyond 0, to negative infinity.
There are 14 whole numbers in that range divisible by 7. There are 19 whole numbers in that range with a 7 in their digits. Three overlap so there is a total of 30 whole numbers with either characteristic.
19
19
109 whole numbers greater than 9 and less than 999 are multiples of 9
it's 5
9,000 of them are
100 (0-99)