Question 653541
The ratio of onion to onion + steak is
{{{ 1 / ( 1 + 6.6 ) = 1/7.6 }}}
Let {{{ x }}} = kg of onion needed
{{{  x / 617.6  = 1/7.6 }}}
{{{ 7.6x = 617.6 }}}
{{{ x = 81.26 }}}
{{{ 617.6 - 81.26 = 536.34 }}}
81.3 kg of onion and 536.3 kg of grilled steak
were used