SOLUTION: Hello, My average is 77.6. My final counts as 20%. What is the worst I can make on the test and pass with a 70% average? I calculated 44. Thank you for answering my question.

Algebra ->  Average -> SOLUTION: Hello, My average is 77.6. My final counts as 20%. What is the worst I can make on the test and pass with a 70% average? I calculated 44. Thank you for answering my question.      Log On


   

Question 603375: Hello,
My average is 77.6. My final counts as 20%. What is the worst I can make on the test and pass with a 70% average? I calculated 44. Thank you for answering my question.
Answer by AnlytcPhil(1807) About Me  (Show Source):
You can put this solution on YOUR website!
Sorry, 44 will only pull the 77.6 grade down to 70.88, so 44
is not the worst you can make and still end up with a 70. 

Since the exam counts 20%, the average of 77.6 counts 80%

So the equation is:

(.80)(77.6) + (.20)x = 70

  62.08 + .2x = 70
          .2x = 70 - 62.08
          .2x = 7.92
            x = 39.6

That's the worst you can do on the final exam.  [But if you can make
an 89.6 you can pull your grade up to 80.]

Edwin