Question 1051624
Let {{{ x }}} = ounces of $1/ounce herbs needed
{{{ ( 45*4 + x*1 ) / ( x + 45 ) = 2.5 }}}
{{{ ( 180 + x ) / ( x + 45 ) = 2.5 }}}
{{{ 180 + x  = 2.5*( x + 45 ) }}}
{{{ 180 + x = 2.5x + 112.5 }}}
{{{ 1.5x = 67.5 }}}
{{{ x = 45 }}}
45 ounces of $1/ounce herbs are needed
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check:
{{{ ( 180 + x ) / ( x + 45 ) = 2.5 }}}
{{{ ( 180 + 45 ) / ( 45 + 45 ) = 2.5 }}}
{{{ 225 / 90 = 2.5 }}}
{{{ 225 = 90*2.5 }}}
{{{ 225 = 225 }}}
OK