SOLUTION: How many grams of salt must be added to 90 grams of a 20% salt solution to make a 25% salt solution?

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Question 835711: How many grams of salt must be added to 90 grams of a 20% salt solution to make a 25% salt solution?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
How many grams of salt must be added to 90 grams of a 20% salt solution to make a 25% salt solution?
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Equation:
salt + salt = salt
1*x + 0.20*90 = 0.25(x+90)
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100x + 20*90 = 25x + 25*90
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75x = 5*90
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x = (1/15)90
x = 6 grams (amt of pure salt to add)
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Cheers,
Stan H.