SOLUTION: How many kg of a 45% copper alloy must be added to 62kg of a 60% copper alloy to form an alloy, which is 50% copper.

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Question 915661: How many kg of a 45% copper alloy must be added to 62kg of a 60% copper alloy to form an alloy, which is 50% copper.
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
How many kg of a 45% copper alloy must be added to 62kg of a 60% copper alloy to form an alloy, which is 50% copper.
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Equation:
copper + copper = copper
0.45x + 0.60*62 = 0.50(x+62)
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45x + 60*62 = 50x + 50*62
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5x = 10*62
x = 124 kg (amt. of 45% alloy needed)
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Cheers,
Stan H.
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