SOLUTION: How many pounds of nuts selling for ​$12 per lb and raisins selling for ​$6 per lb should a person combine to obtain 120 lb of a trail mix selling for ​$8 per&#82

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Question 1038701: How many pounds of nuts selling for ​$12 per lb and raisins selling for ​$6 per lb should a person combine to obtain 120 lb of a trail mix selling for ​$8 per​ lb?
The person would need (__) lb of nuts selling for $12 and (___) lb of raisins selling for $6.

Answer by josgarithmetic(39617)   (Show Source): You can put this solution on YOUR website!
n nuts and r raisins;


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Or you can simply use r for how much raisins, and then 120-r is how much nuts. This then is using only a single variable, r.
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Cost must be dollars.



Quick simplification,





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The method using another example is also shown here:
just one variable for two-part mixture video example

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