How many 4 digits number formed of only odd digits are divisible by five

How many 4 digits number formed of only odd digits are divisible by five

The same answer to how many 3 digit numbers consist of only odd digits.

Assuming repetition is allowed and 0 is not used because it is not an odd digit.

There are 5 odd digits: 1,3,5,7,9

Then, there are 5 choices for the first digit, 5 for the second, 5 for the third. But, for a number to be divisible by 5 it must end in 0 or 5. Since 0 is not an odd digit, we use the 5 and there is one choice.

5*5*5*1