SOLUTION: John recently scored a 96 on a 100-point test. This score brought his overall test average up percentage points to 81%. How many tests has John's class taken in total if every tes
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Question 784597: John recently scored a 96 on a 100-point test. This score brought his overall test average up percentage points to 81%. How many tests has John's class taken in total if every test was 100 points?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
You didn't provide all of the required information. You wrote "...test average up percentage points..." and left out a number between "up" and "percentage". So let's call that number 
. Let's call the number of tests taken 
.
If the final average is 81, then the total points scored on tests is 
. The total points before the last test must then have been either 
or (x\ -\ 1))
, meaning that this is two ways of arriving at the same number. Hence:
(x\ -\ 1))
Once you figure out what was supposed to have been, substitute it and do the arithmetic. Then solve for
John
Egw to Beta kai to Sigma
My calculator said it, I believe it, that settles it
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