SOLUTION: A silversmith mixed 25g of a 70% silver alloy with 50g of a 15% silver alloy. What is the percent concentration of the resulting alloy?

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Question 397050: A silversmith mixed 25g of a 70% silver alloy with 50g of a 15% silver 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 silversmith mixed 25g of a 70% silver alloy with 50g of a 15% silver alloy.
What is the percent concentration of the resulting alloy?
:
Let x = resulting percent concentration (in decimals)
:
Write amt of silver equation
.7(25) + .15(50) = x(25+50)
17.5 + 7.5 = 75x
25 = 75x
x = 25%2F75
x = .333; 33.3% silver is the resulting concentration