Charlie mixes 15 liters of 17% acid solution with a 29% acid solution, which results in 23% acid solution.
1 answer:
(15(.17)+.29x)/(15+x)=.23
2.55+.29x=3.45+.23x
.06x=.9
x=15
So 15L of the 29% solution was added to the 15L of 17% solution to make
30L of 23% solution.
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