<PRE><B>Question 962372</B>
Jessica needs 12 lb of metal with 43% silver. If Jessica combines one metal with 12% silver, and another with 79% silver. How much of each metal does Jessica need? 
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Equations:
silver + silver = silver
0.12x + 0.79(12-x) = 0.43*12
12x + 79*12 - 79x = 43*12
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-67x = -36*12
x = 6.45 lb (amt. of 12% alloy needed)
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12-x = 5.55 lb (amt. of 79% alloy needed)
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Cheers,
Stan H.
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