SOLUTION: If there are seven test and the average is 89% what will i have to make on the next test to get a total of 90%? and can you tell me how you did it please.

SOLUTION: If there are seven test and the average is 89% what will i have to make on the next test to get a total of 90%? and can you tell me how you did it please.

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Question 365329: If there are seven test and the average is 89% what will i have to make on the next test to get a total of 90%? and can you tell me how you did it please.
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
In the first 7 tests his average was 89; hence the sum of his scores on the 7 tests is 623. Let his score on the 8th test be x. .
Hence 623 + x = 720, or x = 97.
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