Question 762766: A student's scores on five test are 96,97,88,88, and 80. What must the score be on the next test so that the average is 85?
Answer by EricWRX(2)   (Show Source):
You can put this solution on YOUR website! You can start by going 85(6)=510 510 being the total mark for 6 tests with an 85 average.
Next, add 96,97,88,88,80 that gives you 449 for 5 tests.
So if you subtract 510-449= 61
This 61 would make the overall mark on 6 tests 510. 510/6= 85
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