I am an odd number. I am less than 100. The sum of my fights is 12. I am a multiple of 15. What number am I?

Try this option:

1. Odd numbers, which are multiple of 15 and less then 100, are: 15, 45 and 75.

2. the sums of digits are: for 15 is 6, for 45 is 9, for 75 is 12.

3. this number is 75.