SOLUTION: how many milliliters of water must be added to 250 ml of 25% salt solution to reduce its concentration to 10%

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Question 511304: how many milliliters of water must be added to 250 ml of 25% salt solution to reduce its concentration to 10%
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
how many milliliters of water must be added to 250 ml of 25% salt solution to reduce its concentration to 10%
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Equation:
water + water = water
x + 0.75*250 = 0.90(x+250)
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Multiply thru by 100 to get:
100x + 75*250 = 90x + 90*250
10x = 15*250
x = 375 ml (amt. of pure water needed)
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Cheers,
Stan H.
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