SOLUTION: If you get a 68 on one test, a 73 on a second test and an 84 on the third test, what score must you get on a fourth test in order to have an average of 80?

SOLUTION: If you get a 68 on one test, a 73 on a second test and an 84 on the third test, what score must you get on a fourth test in order to have an average of 80?

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Question 150189This question is from textbook Introduction to Technical Math
: If you get a 68 on one test, a 73 on a second test and an 84 on the third test, what score must you get on a fourth test in order to have an average of 80? This question is from textbook Introduction to Technical Math

Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
(68+73+84+X)/4=80
225+X=320
X=320-225
X=95 IS THE SCORE REQUIRED ON THE LAST TEST TO MAINTAIN AN AVERAGE OF 80 FOR THE 4 TESTS.
PROOF:
(225+95)/4=80
320=4*80
320=320

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