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The sum of the digits of a two-digit number is 9 less than the number. Which of the following digits is at unit's place of the number ?

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data inadequate

Correct Answer: data inadequate

Explanation:

Let the ten's digit be x and unit's digit be y. Then, (10x + y) - (x + y) = 9 or x = 1.

From this data we cannot find y, the unit's digit. So the data is inadequate..

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