the sum of 2 digits of a number is 15.if 9 is added to the number then the digits are reversed. find the number
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Hence No. is 7×10 +8 = 78 Ans. (10a+b)+9=10b+a, or 9a-9b=-9, a-b=-1 with a+b=15, 2a=14, or a=7; b=8，said number is 78. The sum of two numbers is 48.
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