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01-03-2016
Mathematics

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How much pure acid should be mixed with 6 gallons of a 60% acid solution in order to get an 80% acid solution?

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apologiabiology apologiabiology

01-03-2016

so pure=100%
x added

100%=1=pure

amount times purity=result

x=amount added
x times 1
6-x times (0.6) for te 60%
they add up to
6 times 0.8
solve
x+(6-x)0.6=6(0.8)
x=3

answer is 3 gallons replaced with 100% acid

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