Question 1207744
<pre>
                   PRICE        POUNDS           COST

lowpriced           2.75        100-h           2.75(100-h)

highpriced          5             h             5h

result              3.9         100             5h+2.75(100-h)
</pre>
Using h for the amount of the $5 per pound coffee, ....


This equation formed:  {{{3.9*100=5h+2.75h(100-h)}}};
Solve for h, and evaluate 100-h.


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You already knew what to do.