Answers

2014-03-10T12:55:34+05:30
Let the ones digit no. x
then tens place digit is 7-x
then the no. will be 10(7-x)+x
                             70-9x
acoording to the question
70-9x+9=9x+7
         18x=72
            x=4
therefore the no. is 34
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