SOLUTION: Cory’s average score after 8 tests is 91%. If he gets a 78% on his 9th test what will his new average be?

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Question 977741: Cory’s average score after 8 tests is 91%. If he gets a 78% on his 9th test what will his new average be?
Answer by Cromlix(4381) About Me  (Show Source):
You can put this solution on YOUR website!
Hi there,
If Cory's average score after 8 tests = 91%
then as a total he has 8 x 91 = 728
If on his 9th test he gets 78%
the 728 + 78 = 806
806/9 = 89.6 new average
Hope this helps:-)