Question 551514
Let {{{ x }}} = the number of questions on the test
given:
{{{ 5 }}} = number missed
{{{ x - 5 }}} = number that are right
{{{ ( x - 5 ) / x = .89 }}}
{{{ x - 5 = .89x }}}
{{{ .11x = 5 }}}
{{{ x = 5/.11 }}}
{{{ x = 45.45 }}}
There are 45 questions on the test
check:
{{{ ( 45 - 5 ) / 45 = 40/45 }}}
{{{ 40/45 = .8888 }}}
This is about 89%