Question 1029689
Let {{{ x }}} = her 5th score
[ average of scores ] = [ total of scores] / [ number of games ]
{{{ 120 = ( 115 + 84 + 123 + 101 + x ) / 5 }}}
{{{ 600 = 115 + 84 + 123 + 101 + x }}}
{{{ 600 = 423 + x }}}
{{{ x = 600 - 423 }}}
{{{ x = 177 }}}
The lowest score Laura will 
need in the fifth game is 177