SOLUTION: A goldsmith mixes 8 oz of a 30% gold alloy with 12 oz of a 25% gold alloy. What is the percent concentration of the resulting alloy?

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Question 577721: A goldsmith mixes 8 oz of a 30% gold alloy with 12 oz of a 25% gold alloy. What is the percent concentration of the resulting alloy?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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A goldsmith mixes 8 oz of a 30% gold alloy with 12 oz of a 25% gold alloy.
What is the percent concentration of the resulting alloy?
:
Let x = the resulting per cent
The resulting amt will be 8+12 = 20 oz
:
30(8) + 25(12) = 20x
240 + 300 = 20x
540 = 20x
x = 540/20
x = 27% is the resulting alloy