Question 304836
Let {{{w}}} = gallons of water to be added
{{{.8*30 = 24}}} gallons of salt in 80% solution
{{{24/(30 + w) = .6}}}
{{{24 = .6*(30 + w)}}}
{{{24 = 18 + .6w}}}
{{{.6w = 24 - 18}}}
{{{.6w = 6}}}
{{{w = 10}}}
10 gallons of water must be added