SOLUTION: how much water must be added to 500g of 30 acid solution in order to produce a 20% acid solution?

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Question 585304: how much water must be added to 500g of 30 acid solution in order to produce a 20% acid solution?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
how much water must be added to 500g of 30 acid solution in order to produce a 20% acid solution?
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Equation:
water + water = water
0.70*500 + x = 0.80(500+x)
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70*500 + 100x = 80*500 + 80x
20x = 10*500
x = 250 g (amt. of water needed)
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Cheers,
Stan H.
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