Question 985299
average=total/n
total=n*average
The total must be an average of 90*5 tests or 450.
The current tests add up to 353.  The student needs a 97.
==
Way 2
-8 on first test, -7 on second, +2 on third, +6 on 4th=-7 that has to be overcome.  That means a 97 on the last test.