Markus scored 85, 92, 82, and 94 on the first four tests of the semester. His teacher has not yet told him his score on his fifth test, but did tell him that his score on the fifth test is five points lower than the average (arithmetic mean) of all five tests. Which equation could Markus use to determine the score of the fifth test, x?
4(x + 5) = 353 + x
5(x + 5) = 353 + x
4(x – 5) = 353 + x
5(x – 5) = 353 + x
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Answer:
We can use the 2nd equation.
Step-by-step explanation:
Taking the marks he got in the 5th test to be x, we can say that the average of these tests is (353 + x)/5. According to the question, his score....i.e. x, is 5 marks lower than the average of the 5 tests. So, x = [(353 + x)/5] - 5
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