SOLUTION: emilys test grades are 69, 71, and 67. she wants to bring up her average to a 70. what must she score on her next testing order to have exactly a 70% average?? can you break this

Question 663839: emilys test grades are 69, 71, and 67. she wants to bring up her average to a 70. what must she score on her next testing order to have exactly a 70% average??
can you break this down for me the parent so i can explain to my son please thank you

Answer by vleith(2983) (Show Source): You can put this solution on YOUR website!
Let TestScore4 be the test score on the test that will give Emily an average of 70 across all four test
Average is given by the TestSumTotal/NumberOfTestsTaken

Make sense?
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