4. The sum of the digits of a two digit number is 12. The number obtained by interchanging the two digits exceeds the given number by 18. Find the number. (CBSE (CCE) 2011)

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Let's denote the tens digit of the two-digit number as xx and the units digit as yy. The original number can then be represented as 10x+y. According to the given conditions: The sum of the digits of the two-digit number is 12:
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Let's denote the tens digit of the two-digit number as xx and the units digit as yy. The original number can then be represented as 10x+y. According to the given conditions: The sum of the digits of the two-digit number is 12: read less
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