SOLUTION: A 20-ounce alloy of platinum costs $220 per ounce is mixed with an alloy that costs $400 per ounce. How many ounces of the $400 alloy should be used to make an alloy that costs $30

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Question 224049: A 20-ounce alloy of platinum costs $220 per ounce is mixed with an alloy that costs $400 per ounce. How many ounces of the $400 alloy should be used to make an alloy that costs $300 per ounce?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
A 20-ounce alloy of platinum costs $220 per ounce is mixed with an alloy that costs $400 per ounce. How many ounces of the $400 alloy should be used to make an alloy that costs $300 per ounce?
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Equation:
value + value = value
220*20 + 400x = 300(20+x)
220*20 + 400x = 300*20 + 300x
100x = 80*20
x = 16 ounces (amt. of $400 alloy needed for the mixture)
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Cheers,
Stan H.