SOLUTION: A nurse has 40 ml of a 10% solution of a medicine. How many milliliters of a 5% solution of this medicine must be mixed in order to obtain a mixture that is an 8% solution of this

Question 933310: A nurse has 40 ml of a 10% solution of a medicine. How many milliliters of a 5% solution of this medicine must be mixed in order to obtain a mixture that is an 8% solution of this medicine?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A nurse has 40 ml of a 10% solution of a medicine. How many milliliters of a 5% solution of this medicine must be mixed in order to obtain a mixture that is an 8% solution of this medicine?
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Equation:
active + active = active
0.10*40 + 0.05x = 0.06(40+x)
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10*40 + 5x = 6*40 + 6x
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x = 4*40
x = 160 ml (amt of 5% solution to add)
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Cheers,
Stan H.
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