Question 266260
{{{x}}} = liters needed
{{{(.03x + .06*24)/(x + 24) = .04}}}
{{{.03x + 1.44 = .04*(x + 24)}}}
{{{.03x + 1.44 = .04x + .96}}}
Multiply both sides by {{{100}}}
{{{3x + 144 = 4x + 96}}}
{{{x = 144 - 96}}}
{{{x = 48}}}
48 liters of 3% mixture must be added
check:
{{{(.03x + .06*24)/(x + 24) = .04}}}
{{{(.03*48 + .06*24)/(48 + 24) = .04}}}
{{{(1.44 + 1.44)/72 = .04}}}
{{{2.88/72 = .04}}}
{{{2.88 = 2.88}}}
OK