Question 419129
<pre>
PRICE        VOLUME-barrels         COST
 100           150                   15000
 150            v                      150v
 190            v                      190v
-----------------------------------------------
 120         2v+150              340v+15000
</pre>
Result mix must be 120 dollars per barrel.
{{{(340v+15000)/(2v+150)=120}}}

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{{{highlight(v=30)}}}