Question 1069680
The final exam is equivalent to two regular 100-point exams.

That means, 3 regular + 2 regular = 5 regular, examinations.

Emphasis for grading is on the average for the three regular plus one final tests.  Target minimum percent average for grade A is  90%.


{{{highlight_green((82+88+91+x+x)/5=90)}}}
This should be the equation to solve; and understand you can say {{{2x}}} in place of the {{{x+x}}} in the numerator.  The variable , x, is the score on the final exam.  Remember, this final exam counts as TWO regular tests.


Same as  {{{highlight_green((82+88+91+2x)/5=90)}}};
Just SOLVE for x.
That will be the minimum score needed to get average 90% on all the tests plus final.