Question 775974
Let {{{ x }}} = pounds of $5 coffee needed
{{{ 5x }}} = cost of the $5 coffee
{{{ 3*9 = 27 }}} = cost of the $3 coffee
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{{{ ( 5x + 27 ) / ( x + 9 ) = 2 }}}
{{{ 5x + 27 = 2*( x + 9 ) }}}
{{{ 5x + 27 = 2x + 18 }}}
{{{ 3x = -9 }}}
{{{ x = -3 }}}
The negative answer tells me it can't be solved.
Logically, there is no way you can mix $5/pound
coffee with $3/pound coffee and end up with
$2/pound coffee
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The cost/pound of the final mixture has to be
somewhere between $3 and $5