Math
posted by Aubrey .
The tens digit is a multiple of 5
The hundreds digit is 1 less than the tens digit
The ones digit is less than the hundreds digit
The sum of the digits is a multiple of 6
What is the mystery number??

_ _ _
Tens digit:
_ 5 _
Hundreds digit:
4 5 _
Ones digit must be 0, 1, 2, or 3
4 5 ?
Take it from there. 
453