SOLUTION: how much pure acid should be mixed with 6 gallons of a 50% acid solution to get a 70% acid solution?

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Question 455272: how much pure acid should be mixed with 6 gallons of a 50% acid solution to get a 70% acid solution?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
how much pure acid should be mixed with 6 gallons of a 50% acid solution to get a 70% acid solution?
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Eqquation:
acid + acid = acid
x + 0.50(6) = 0.70(x+6)
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Multiply thru by 100 to get:
100x + 50*6 = 70x + 70*6
30x = 20*6
x = 4 gallons (amt. of pure acid needed)
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Cheers,
Stan H.
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