Question 583645
I have a 2 digit number
I am a multiple of 5
I  am less than 30
My digit sum is six
<pre>
Since I have only 2 digits and am a multiple of 5,
my second digit is either 5 or 0

Since my digit sum is six, I am either 15 or 60.

Since I am less than 30, I am 15.

Edwin</pre>