Question 667133
Let {{{ x }}} = pounds of $6 tea needed
{{{ ( 6x + 4.5*20 ) / ( x + 20 ) = 5 }}}
{{{ ( 6x + 90 ) / ( x + 20 ) = 5 }}}
{{{ 6x + 90 = 5*( x + 20 ) }}}
{{{ 6x + 90 = 5x + 100 }}}
{{{ x = 10 }}}
10 pounds of $6 tea are needed
check:
{{{ ( 6*10 + 90 ) / ( 10 + 20 ) = 5 }}}
{{{ 150 / 30 = 5 }}}
{{{ 5 = 5 }}}
OK