SOLUTION: [ how many liters of a 40% alcohol solution must be mixed with 60 liters of a 70% solution to get a 50% solution? ]

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Question 818591: [ how many liters of a 40% alcohol solution must be mixed with 60 liters of a 70% solution to get a 50% solution? ]
Answer by TimothyLamb(4379) About Me  (Show Source):
You can put this solution on YOUR website!
40w + 70(60) = 50V
V = w + 60
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40w + 70(60) = 50V
40w + 4200 = 50V
40w + 4200 = 50(w + 60)
40w + 4200 = 50w + 3000
10w = 1200
w = 120
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answer:
need 120 liters of the 40% solution
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