SOLUTION: how many liters of water must be added to 20 liters of a 70% antifreeze solutionto produce a 50% solution?

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Question 150237: how many liters of water must be added to 20 liters of a 70% antifreeze solutionto produce a 50% solution?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
how many liters of water must be added to 20 liters of a 70% antifreeze solution to produce a 50% solution?
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EQUATION:
water + water = water
(0.30)*20 + x = (0.50)(20+x)
6 + x = 10 + (1/2)x
(1/2)x = 4
x = 8 liters of water must be added
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Cheers,
Stan H.