Question 1154828
Let {{{ x }}} = pounds of sunflower seeds needed
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{{{ ( .6*100 + 1.1x ) / ( 100 + x ) = .7 }}}
{{{ 60 + 1.1x = .7*( 100 + x ) }}}
{{{ 60 + 1.1x = 70 + .7x }}}
{{{ .4x = 10 }}}
{{{ x = 25 }}}
25 pounds of sunflower seeds are needed
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check:
{{{ ( .6*100 + 1.1x ) / ( 100 + x ) = .7 }}}
{{{ ( .6*100 + 1.1*25 ) / ( 100 + 25 ) = .7 }}}
{{{ ( 60 + 27.5 ) / 125 = .7 }}}
{{{ 87.5 / 125 = .7 }}}
{{{ .7 = .7 }}}
OK