SOLUTION: Four test scores are 70, 84, 65, and 92. What must you earn on the fifth test in order to get the average of 80.

Question 1010562: Four test scores are 70, 84, 65, and 92. What must you earn on the fifth test in order to get the average of 80.
Answer by 0309083(1) (Show Source): You can put this solution on YOUR website!
You have 5 test trying to get an average of 80, so multiply the 5 test you are taking times the average to see the sum of all your grades, 80*5= 400, now subtract the ones you know, 400-89-84-65-92-70, and you get 89, you can check this by adding up all your known grades plus 89 and dividing it by the grades getting an average of 80, 89+84+65+92+70+89= 400/5= 80.
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