Question 126663
{{{(.25x + .05y) / 500 = .2}}}
{{{x + y = 500}}}
{{{y = 500 - x}}}
{{{(.25x + .05(500 - x)) / 500 = .2}}}
{{{(.25x + 25 - .05x) / 500 = .2}}}
{{{(.2x + 25) / 500 = .2}}}
{{{.2x + 25 = 100}}}
{{{.2x = 75}}}
{{{x = 375}}}
{{{y = 500 - 375}}}
{{{y = 125}}}
He needs 375 ml of the 25% solution and 125 ml of the 5% solution