Question 373733
Let {{{x}}} = liters of 70% solution used
In words:
(final liters of acid)/(final liters of solution) = 30%
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given:
{{{.7x}}} = liters of acid in 70% solution
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{{{.7x/(x + 12) = .3}}}
{{{.7x = .3*(x + 12)}}}
{{{.7x = .3x + 3.6}}}
{{{.4x = 3.6}}}
{{{x = 9}}}
In the 30% solution, there are 9 liters of 70% solution
and 12 liters of distilled water
{{{9 + 12 = 21}}} liters of 30% solution produced