SOLUTION: how many integers between 9 and 99 have an even tens digit and an odd units (ones) digit?

Question 954263: how many integers between 9 and 99 have an even tens digit and an odd units (ones) digit?
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!

First, which numbers between and have an digit?
All the , , , and .
Now just look at the . How many of those have odd units () digits?
That would be , , ,, and , which makes numbers.
It is the same for the , , and , so the final answer is:

there is integers between and that have an even tens digit and an odd units (ones) digit
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