SOLUTION: Tom scored 75, 78, 87, 81 and 76 on five exams. What grade must Tom obtain on his sixth exam to have an average of 80?
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Question 319469: Tom scored 75, 78, 87, 81 and 76 on five exams. What grade must Tom obtain on his sixth exam to have an average of 80?
Found 2 solutions by stanbon, nerdybill:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Tom scored 75, 78, 87, 81 and 76 on five exams. What grade must Tom obtain on his sixth exam to have an average of 80?
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Let the 6th grade be "x".
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Equation:
Solve for "x".
(75+78+87+81+76+x)/6 = 80
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Cheers,
Stan H.
Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
Let x = score on sixth exam
then
(75+78+87+81+76+x)/6 = 80
(75+78+87+81+76+x) = 480
(397+x) = 480
397+x = 480
x = 480-397
x = 83
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