Question 760405
Let {{{ x }}} = the grade she needs
{{{ ( 67 + 81 + 98 + x ) / 4 = 85 }}}
{{{ ( 246 + x ) / 4 = 85 }}}
{{{ 246 + x = 4*85 }}}
{{{ x = 340 - 246 }}}
{{{ x = 94 }}}
He must score 94 in order to average 85