SOLUTION: how many milliliters of a 20% solution should be added to a 50 milliliters of 40% solution to obtain 25% solution?

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Question 309518: how many milliliters of a 20% solution should be added to a 50 milliliters of 40% solution to obtain 25% solution?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
how many milliliters of a 20% solution should be added to a 50 milliliters of 40% solution to obtain 25% solution?
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Equation:
active + active = active
0.40*50 + 0.20x = 0.25(50+x)
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Multiply thru by 100 to get:
40*50 + 20x = 25*50 + 25x
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5x = 15*50
x = 150 milliliters (amt. of 20% solution needed in the mixture)
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Cheers,
Stan H.