Question 425514
Let {{{x}}} = the ounces of salt he needs to add
given:
He has {{{ .2*20 = 4}}} ounces of salt in solution now
In words:
( ounces of salt in final solution)/(total ounces in final solution) = % salt
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{{{ ( x + 4)/( x + 20) = .25 }}}
{{{ x + 4 = .25*( x + 20 ) }}}
{{{ x + 4 = .25x + 5 }}}
{{{ .75x = 1 }}}
{{{ x = 4/3 }}}
He needs 1.333 ounces of salt
check:
{{{ ( x + 4)/( x + 20) = .25 }}}
{{{ ( 1.333 + 4)/( 1.333 + 20) = .25 }}}
{{{ 5.333/21.333 = .25 }}}
{{{ .249988 = .25 }}}
error due to roundoff