Question 391541
In words:
(salt)/(salt + water) = 25%
Let {{{a}}} = gallons of 65% solution needed
Salt in 65% solution = {{{.65a}}}
There is no salt in the pure water
{{{.65a/(a + 8) = .25}}}
{{{.65a = .25*(a + 8)}}}
{{{.65a = .25a + 2}}}
{{{.4a = 2}}}
{{{a = 5}}}
5  gallons of 65% solution are needed