Question

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??

Answer 1

_ _ _

Tens digit:

_ 5 _

Hundreds digit:

4 5 _

Ones digit must be 0, 1, 2, or 3

4 5 ?

Take it from there.

Answer 2

453