Question 314109
I do this the easy way, with plus and minus points.  If he needs an AVERAGE of 95, just figure each score as a + or - points from 95.  The first grade is 95, so that is + or - 0.  The second grade is 91, which is a -4 from 95.  So he needs a +4 points on the third test to average to 95, so he needs 95+4=99 on the third test.


If you need an equation to solve it will look like this:
{{{(95+91+x)/3=95}}}.  This works well also, but it takes longer.


Dr. Robert J. Rapalje, Retired