Frank has a 2 digit number on his baseball uniform. the number is a multiple of ten and has 3 for one of its digits what three numbers could frank have on his uniform

If the number is a multiple of ten, then its last digit must be ' 0 '.

If one of its digits is ' 3 ', then that must be the first one,
and the whole 2-digit number must be ' 30 '.

I believe that's the only possibility.  I'll be very interested to see
somebody else come up with a 2-digit number that's a multiple
of 10, has 3 as one of its digits, and isn't  30 .