SOLUTION: The average score of the six tests was 82. The five scores were 91,87,78,86, and 72. What was the score of the sixth test?
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Question 451024: The average score of the six tests was 82. The five scores were 91,87,78,86, and 72. What was the score of the sixth test?
Found 2 solutions by solver91311, rwm:
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
Think about how you get the average. You added up the 6 scores and divided the total by 6. That means that the total of the 6 scores is 82 times 6. If you add the 5 scores you know, you can subtract that total from the product 82 times 6 and the difference has to be the unknown score.
John
My calculator said it, I believe it, that settles it
Answer by rwm(914) (Show Source): You can put this solution on YOUR website!
x=6*72-(91+87+78+86+72)
x=432-414
x=18
another way
91-72=+19
87-72=15
78-72=+6
86-72=+14
72-72=0
19+15+6+14=34+20=54
72-54=18
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