Question 1001820
Table or Chart?  Creating one would seem more trouble than needed.  Maybe try to understand this as a uniform rates situation.
{{{PRICE*QUANTITY=COST}}}
{{{PRICE=COST/QUANTITY}}}
Cost does not appear in the description; only prices and quantities.  Cost will need to be included and the person analyzing the problem should include cost.




<pre>
               Price        Qty     COST

Spanish         84           x      84x

Virginia        71          40      71*40

Mixture         79         x+40     84x+71*40
</pre>
Now, use the basic formula relating price, quantity and cost.  The expressions and numbers are shown in the Mixture row.


{{{highlight_green((84x+71*40)/(x+40)=79)}}}
Solve for x.  That is the quantity of Spanish Peanuts to use for making the needed mixture price.