Question 372727
To find the average, sum the scores and divide by {{{3}}}.
Assume she gets {{{X}}} on the last test.
{{{A>=90}}}
{{{(83+92+X)/3>=90}}}
{{{176+X>=270}}}
{{{highlight(X>=94)}}}
You also know that {{{X<=100}}}
{{{94<=X<=100}}}