The ten's digit of a 2-digit number is greater than the units digit by 7. If we subtract 63 from the number, the new number obtained is a number formed by interchange of the digits. Find the number.
A) 81 B) 18 C) 62 D) 26
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the answer is a 81 because 81 - 63 is equal to 18 which is obtained by the interchange of the digits
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