Word Problem :
The number has 3 digits
the tens digit is half the hundreds digit
the number is odd
the sum of the digits is 9
The number in the one's place is either 1, 3, 5, 7, or 9.
The number in the hundreds place is either 2, 3, 4
The number in the tens place is either 4, 6, or 8.
Take it from there.