Question 209712
A goldsmith has two alloys that are different purities of gold. The first is three-fourths pure gold and the second is five-fifths pure gold. How many ounces of each should be melted and mixed in order to obtain a 6-oz mixture that is two-thirds pure gold? 
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You cannot add pure gold to 75% gold and expect to get 66.67% gold.
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There is no solution to the problem as you have posted it.
Cheers,
Stan H.
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