SOLUTION: If my average is 87 and I take a test and make a 100 what is my average now?

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Question 844064: If my average is 87 and I take a test and make a 100 what is my average now?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
You can't answer the question until you
know how many tests you took before
the last test
Suppose you took 9 tests to give you the 87 average
Your total score up to that point is +9%2A87+=+783+
The 10th test adds +100+ to that
+783+%2B+100+=+883+
Average = +883+%2F+10+
+883+%2F+10+=+88.3+ average