Question 838875
Let {{{ x }}} = ounces of pure apple juice to be added
{{{ .25*16 = 4 }}} ounces of pure apple juice in 25% mixture
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{{{ ( 4 + x ) / ( 16 + x ) = .4 }}}
{{{ 4 + x = .4*( 16 + x ) }}}
{{{ 4 + x = 6.4 + .4x }}}
{{{ .6x = 2.4 }}}
{{{ x = 4 }}}
4 ounces of pure apple juice must be added
check:
{{{ ( 4 + x ) / ( 16 + x ) = .4 }}}
{{{ ( 4 + 4 ) / ( 16 + 4 ) = .4 }}}
{{{ 8/20 = .4 }}}
{{{ 8 = 8 }}}
OK