Question 351004: Here's my question:
To conduct a new experiment, a scientist needs a 23% salt water solution. How much of a 10.5% solution must be mixed with 25 pints of a 39% solution to get the proper solution?
I think i got the equation, but the answer doesnt work out right. This is what i thought: .105x+ 25(.39)= .23. Where am i going wrong, can you please help me?
Unless it should go .105x + .23y= 25(.39)
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! To conduct a new experiment, a scientist needs a 23% salt water solution. How much of a 10.5% solution must be mixed with 25 pints of a 39% solution to get the proper solution?
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Equation:
salt + salt = salt
0.105x + 0.39*25 = 0.23(x+25)
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Multiply thru by 1000.
105x + 390*25 = 230x + 230*25
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125x = 160*25
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x = 32 pints (amt. of 10.5% solution needed for the mixture)
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Cheers,
Stan H.
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