The sum of the digits of a two-digit number is 7 .If 9 is added to the number, its digits are reversed .Find the number.
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The original number = 10x + y . Number obtained on reversing the digits = 10y + x . Now, ⇒ 10y + x = 10x + y + 9
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The original number = 10x + y . Number obtained on reversing the digits = 10y + x . Now, ⇒ 10y + x = 10x + y + 9 .
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