<PRE><B>Question 551158</B>
The sum of the digits if a certain two digit number is 6. If the original number is subtracted from the number formed by interchanging the digits, the result is 36. What is the original number? 
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The difference when swapping the digits is always 9 times the difference between the digits.
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So,
t + u = 6
t - u = 4
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Can you finish it?
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