Between them, not including them it is 36.
If you include these two numbers, it would be 38.
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Any number between 64 & 81 inclusive.
18/27 minus 44/81 is 10/81
118
The factors of 81 that are between 2 and 10 are 3 and 9.
45, 63, 81, 99 4 of them.