Sri Lanka
You are given a number N with the property that every next digit of N is greater than the previous digit (so second digit from the left is greater than the first digit, and third digit is greater than the second and so on). Now multiply N by 9. What is the sum of the digits of the resulting number?
Answer:
9
- We know that any number when multiplied by 9 will give a number whose sum of digits is always 9.
