SOLUTION: i was tought this but i forgot sooo: how many grams of salt must be added to 30 grams of a 20% salt solution to obtain a 25% salt solution?

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Question 212521: i was tought this but i forgot sooo: how many grams of salt must be added to 30 grams of a 20% salt solution to obtain a 25% salt solution?
Answer by stanbon(48558) About Me  (Show Source):
You can put this solution on YOUR website!
how many grams of salt must be added to 30 grams of a 20% salt solution to obtain a 25% salt solution?
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Equation:
salt + salt = salt
0.20*30 + x = 0.25(30+x)
Multiply thru by 100 to get:
600 + 100x = 25*30 + 25x
75x = 150
x = 2 grams (amt. of salt that must be added to the mixture)
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Cheers,
Stan H.