Question 560951
Let the cost/pound  of the remaining coffee = {{{ x }}}
Cost of remaining coffee = {{{ 120x }}}
Cost of $6.50 / pound blend = {{{ 80*6.5 = 520 }}}
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{{{ ( 120x + 520 ) / 200 = 8.15  }}}
{{{ 120x + 520 = 8.15*200 }}}
{{{ 120x + 520 = 1630 }}}
{{{ 120x = 1630 - 520 }}}
{{{ 120x = 1110 }}}
{{{ x = 9.25 }}}
The cost/pound  of the remaining coffee = $9.25
check answer:
{{{ ( 120*9.25 + 520 ) / 200 = 8.15  }}}
{{{ ( 1110 + 520 ) / 200 = 8.15 }}}
{{{ 1630 / 200 = 8.15 }}}
{{{ 1630 = 8.15*200 }}}
{{{ 1630 = 1630 }}}
OK