There are 126 of them.
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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.
How many two digit number are divisible by 5
There are 6804 such numbers.
The first digit can have 5 possible numbers, the second digit can have 4, the third 3, the fourth 2. 5
There are 5! = 120 such numbers.