Question 1197175
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A supplement to the answer @greenestamps provided:


If you include each endpoint, then {{{40 <= 5(n+1) <= 65}}} solves to {{{7<=n<=12}}} which means your potential number is either 7, 8, 9, 10, 11, or 12. I agree that the term "between" is ambiguous.


Example:
Let's say your number was 8
Add 1 to get 8+1 = 9
Multiply by 5 to get 9*5 = 45 
This fits the criteria since it's between 40 and 65
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