SOLUTION: how many liters of 30% silver must be added to 80 liters of 50% silver to make an alloy that is 40% silver?

Question 868941: how many liters of 30% silver must be added to 80 liters of 50% silver to make an alloy that is 40% silver?
Found 2 solutions by stanbon, ewatrrr:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
how many liters of 30% silver must be added to 80 liters of 50% silver to make an alloy that is 40% silver?
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Equation:
silver + silver = silver
0.30x + 0.50*80 = 0.40(x+80)
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30x + 50*80 = 40x + 40*80
10x = 10*80
x = 80 liters (amt. of 30% alloy to add)
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Cheers,
Stan H.
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Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

Hi
.30x + .50(80L) = .40(80L + x)
.10(80L) = .1x
.10(80L)/.1 = x

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