Question 1197175
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            Usually, even young students of the  4-th grade level can solve such problems using a backward method   

            and making inverse operations in the inverse order.


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Solving this way, you make two steps:


    (1)  You divide 40 and 65 by 5, and you conclude that your numbers are integer numbers between 8 and 13.


    (2)  Then the next and the last step is to subtract 1 from the numbers, obtained in step (1).

         Doing it, you conclude that your original numbers are integer numbers between  8-1 = 7  and  13-1 = 12.



<U>ANSWER</U>.  Thus you found out that the original numbers are integer numbers between 7 and 12.
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Solved for the &nbsp;4-th grade level without using equations, &nbsp;with full explanations.