Add the digits together. The sum of the digits of 23 is 5.
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34.
Any number using each of the digits once will be a multiple of 3: eg 1597864302
Possibility of two digit no whose sum is 9 18,27,36,45,54,63,72,81 Now add 9 to each no mentioned above 27,36,45,54,63,72,81,90 See after third comma 45 and 54. Reverse of 45 is 54. 54 is 9 more than the no 45. So 45 is original
The last digit is always the estimated digit in a number
Possibility of two digit no whose sum is 7 16,25,34,43,52,61 Now subract 27 to each no mentioned above -9,-2,7,16,25,34 See after 4th comma 52 and 25.reverse of 52 is 25. That no 25 is 27 less than 52. Original no is 52;new no is 25