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[please consult "answer" section]

We are given that a number has 5 digits, and asked to find the number's digits.
Luckily, we're given some clues that will help us find the digits.
First, the ones digit of the 5-digit number is 3:-
_ _ _ _ 3
Now, the hundred digit is 2 times the ones digit:-

_ _ 6 _ 3
Now, the tens digit is the sum of ones & hundred digits, or
6+3=9
So we have
_ _ 693
Now, the thousand and ten thousand digit is 1 less than the hundred digit, or
6-1=5
So we conclude that the 5-digit number is

Good luck.
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