We start with the number n :



So to begin with, we have " n "

 

>>...double the number...<<



Now so far we have " 2n "



>>...add 5...<<



Now so far we have " 2n + 5 "





>>...double the result...<<



Now so far we have " 2(2n+5) "  or " 4n + 10 "



>>...subtract 10...<<



Now so far we have " 4n+10 - 10 ", or " 4n " 



>>...divide the answer by 4<<



Now so far we 4n/4 or " n ", back where we started!



So no matter what you start with, you end up with what you started with,



So if you start with 1, 3, 5 or 7, or any other number, you end up with 1, 3,

5, or 7, or whatever number you started with.



Edwin  

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