Question 940371
{{{ .1*1 = .1 }}} liters of alcohol in 10% mixture
{{{ .3*3 = .9 }}} liters of alcohol in 30% mixture
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{{{ ( .1 + .9 ) / ( 1 + 3 ) = 1/4 }}}
{{{ 1/4 = .25 }}}
{{{ .25*100 = 25 }}}
the mixture is 25% alcohol