kalamraf kalamraf

01-04-2018
Mathematics

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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?

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MsEHolt MsEHolt

10-04-2018

The sum of the digits is 9.

Try using any numbers; for instance, 123. 123*9 = 1107; 1+1+0+7 = 9.

Try 24. 24*9 = 216; 2+1+6 = 9.

Even 13: 13*9 = 117; 1+1+7 = 9.

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