Question

Is sum of a number two digits and the numbers formed by reversing the digit is 99 , then what is the sume of digits of the original number?

Answer 1

Let number is 90 or 09

90 + 09 = 99         9 + 0  = 9

If 18 or 81

18 + 81 = 99           1+ 8  = 9

if number is 27 or 72

27 + 72 = 99          2 + 7  =9

number 36 or 63

36 + 63 = 99         3 + 6 = 9

If number is 45 or 54

45 + 54 = 99         5 + 4  = 9

etc

Sum of digits of originl number is always comes 9