SOLUTION: Amy has an 85 average on her five math tests. Her teacher tells her she can drop her single low score of 65. What is her new average?

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Question 797819: Amy has an 85 average on her five math tests. Her teacher tells her she can drop her single low score of 65. What is her new average?
Answer by KMST(5328) About Me  (Show Source):
You can put this solution on YOUR website!
S= sum of 4 best scores
S%2B65= sum of the scores for all five tests
The average the 5 tests is calculated as %28S%2B65%29%2F5 and it was 85, so
%28S%2B65%29%2F5=85
S%2B65=5%2A85
S%2B65=425
S=425-65
S=360
So the average of the 4 scores that add up to 360 is
360%2F4=highlight%2890%29