Answers

2014-02-26T18:17:01+05:30
Unit digit is >tenth digit since after multiply with 9 we get   twice of  reverse number .....

so consider left is (x+7) and right digit is x.....
now 9*(10*x+(x+7))=2(((x+7)*10) +x)
⇒ 99 x+63= 22x +140
⇒77x=77
⇒x=1......
so another no is 8...so number is 18...
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