SOLUTION: How many liters of 20% silver must be added to 90 liters of 70% silver to make an alloy that is 30% silver?

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Question 1054261: How many liters of 20% silver must be added to 90 liters of 70% silver to make an alloy that is 30% silver?
Answer by Alan3354(69443) About Me  (Show Source):
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How many liters of 20% silver must be added to 90 liters of 70% silver to make an alloy that is 30% silver?
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Add L liters.
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20*L + 90*70 = (L + 90)*30