Question 157002
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<pre>
The side lengths are three consecutive odd integer summed up to 51:


(x-2), x and (x+2),


(x-2) + x + (x+2) = 51


3x = 51  ====>  x = {{{51/3}}} = 17  ===>  the numbers are  17-2 = 15,  17  and 17+2  = 19.
</pre>

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1.  &nbsp;&nbsp;Solved. 



2.  &nbsp;&nbsp;There is &nbsp;<U>NOTHING more easy</U>&nbsp; than that.



3.  &nbsp;&nbsp;The lessons to learn are &nbsp;<U>THESE</U>:


<pre>
    If three consecutive integer sum up to the integer N, then  

       a)  N is a multiple of 3;  b)  the medium number is {{{N/3}}};  c)  the three numbers are {{{N/3-1}}}, {{{N/3}}} and {{{N/3+1}}}.



    If three consecutive ODD integers sum up to the integer N, then  

       a)  N is a multiple of 3;  b)  the medium number is {{{N/3}}};  c)  the three numbers are {{{N/3-2}}}, {{{N/3}}} and {{{N/3+2}}}.



    If three consecutive EVEN integers sum up to the integer N, then  

       a)  N is a multiple of 3;  b)  the medium number is {{{N/3}}};  c)  the three numbers are {{{N/3-2}}}, {{{N/3}}} and {{{N/3+2}}}.
</pre>


MEMORIZE it for all your life.