SOLUTION: A silversmith has two alloys, one containing 50% silver and the other 30% silver. How much of each should be melted and combined to obtain 400 grams of an alloy containing 42% silv

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Question 978500: A silversmith has two alloys, one containing 50% silver and the other 30% silver. How much of each should be melted and combined to obtain 400 grams of an alloy containing 42% silver?
Answer by josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
m, how much 30%
400-m, how much 50%

%2830m%2B50%28400-m%29%29%2F400=42