SOLUTION: A tank holds 40 liters of a chemical solution. Currently, the solution has a strength of 10%. How much of this should be drained and replaced with 50% solution to get a final stren
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Question 785670: A tank holds 40 liters of a chemical solution. Currently, the solution has a strength of 10%. How much of this should be drained and replaced with 50% solution to get a final strength of 30%? Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! A tank holds 40 liters of a chemical solution. Currently, the solution has a strength of 10%. How much of this should be drained and replaced with 50% solution to get a final strength of 30%?
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Equation:
active-active + active = active
0.10*40 - 0.10x + 0.50x = 0.30*40
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10*40 - 10x + 50x = 30*40
40x = 20*40
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x = 20 liters (amt. to be removed and replaced)
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Cheers,
Stan H.
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