Question 981112
find all two digit numbers  where are the tens digit is 2 more than the ones
digit and each number is greater than 60 
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each number is greater than 60.
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So the tens digit is either 6,7,8, or 9.
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the tens digit is 2 more than the ones digit.
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Rewrite that equivalently as 
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the ones digit is 2 less than the tens digit.
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Thinking of it that way makes it easy:

2 less than 6,7,8,9 is 4,5,6,7 respectively.

Answers 64,75,86,97    

Edwin</pre>