SOLUTION: One of the digits of a two digits number is twice the other digit. the sum of the original number and the number formed by reversing the digits is 99. Find the number.

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Question 901333: One of the digits of a two digits number is twice the other digit. the sum of the original number and the number formed by reversing the digits is 99. Find the number.
Answer by Edwin McCravy(20054) About Me  (Show Source):
You can put this solution on YOUR website!
  XY
 +YX
  99

To add two numbers and get an odd number like 9, one has to be 
odd and the other even.  And since one is twice the other and they
add to 9 they can only be 3 and 6.  So it could be either

  36      63 
 +63  or +36 
  99      99

It's either 36 or 63.

Edwin