Question 1125749
<pre>
SIZE(oz)          PRICE        CUPS       REVNU
10                0.95         x           0.95x
14                1.15         y           1.15y
20                1.50         z           1.50z
TOTAL, 404                    28          33.00
</pre>

{{{system(10x+14y+20z=404,x+y+z=28,0.95x+1.15y+1.5z=33)}}}


{{{system(5x+7y+10z=202,x+y+z=28,19x+22y+30z=660)}}}



results
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{{{system(x=12,y=6,z=10)}}}
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(used http://matrix.reshish.com/gaussSolution.php )