39905

my solution for four digit answer for the problem is...

1) 7443

2) 8876

3) 9966

4) 1225

5) 5001

For question 1 is 7443 because the units digit is 3 which is an odd number.
For question 2 is 8876 because the units digit is 6 which is an odd number.
For question 3 is 9966 because it is the highest number that can be divisible
by 3.
For question 4 is 1225 because the units digit is 5 that can be a multiple of
5 and it's a smallest number.
For question 5 is 5001 because 5000 and 5001 the difference is 1 so that's
certain.