Question 580575
Let {{{ x }}} = gallons of .5 pound/gallon solution needed
{{{ .5x }}} = pounds of salt in .5 pound/gallon solution
{{{ .2*5 = 1 }}} = pounds of salt in .2 pound/gallon solution
--------------
{{{ ( .5x + 1 ) / 5 = .3 }}}
{{{ .5x + 1 = .3*5 }}}
{{{ .5x + 1 = 1.5 }}}
{{{ .5x = .5 }}}
{{{ x = 1 }}}
1 gallon of .5 pound/gallon solution is needed
check answer:
{{{ ( .5*1 + 1 ) / 5 = .3 }}}
{{{ 1.5/5 = .3 }}}
{{{ 1.5 = 1.5 }}}
OK