The Answer is 22

Select any 3-digit number with all digits different from one another. Write all possible 2-digit numbers that can be formed from the 3-digits selected earlier. Then divide their sum by the sum of the digits in the original 3-digit number.

e.g.    Consider a 3-digit number 365.

         All possible 2-digit numbers are 36, 35, 63, 65, 53, 56.

         Their sum is 36+35+63+65+53+56=308

         Sum of the digits of original number is 3+6+5=14

         Then 308/14=22