In a 2-digit number,
Question:

In a 2-digit number, the unit’s place digit is x. If the sum of digits be 9, then the number is (10x – 9).

Solution:

False

Given, unit’s digit = x

and sum of digits = 9

Ten’s digit = 9 – x

Hence, the number = 10 (9 -x)+x = 90 -10x + x = 90 – 9x

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