Question 1203158
<pre>
smallest            c
largest            c+100
third angle       (1/3)(c+100)
SUM                180
</pre>
That is exactly as described, except that a separate variable was not assigned for "the third angle".  
Also notice as expressed, largest IS three times the size of the "third" side.  

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<pre>
RESULTS
smallest     20
largest     120
the third    40
</pre>