With a total of 90,000 five digit numbers, we can conclude that there is 45,000 EVEN five digit numbers.
There are five such numbers.
There are 252 of them.
There are 450 such numbers.
4,000 even numbers, 4,000 odd numbers.
There are 5460 five digit numbers with a digit sum of 22.
There are 180 3-digit numbers divisible by five.
500 or so.
There are 4500 such numbers.
There are 449999 such numbers.
Not sure what a "didget" is. It is possible to make 18 5-digit numbers.
There are 450 even three-digit integers, from 100 to 998. This excludes numbers with leading zeroes (000 to 099).
198 of them.
There are 41 of them.
There are 1140 five digit combinations between numbers 1 and 20.
The answer will depend on how many digits there are in each of the 30 numbers. If the 30 numbers are all 6-digit numbers then the answer is NONE! If the 30 numbers are the first 30 counting numbers then there are 126 combinations of five 1-digit numbers, 1764 combinations of three 1-digit numbers and one 2-digit number, and 1710 combinations of one 1-digit number and two 2-digit numbers. That makes a total of 3600 5-digit combinations.
There are 5760 such numbers.