Anne scored 75, 81 ,77 , and 83 in her four tests. What score should she get in her fifth test to have an average of 80?
2 answers:
Remark
You set this up as (75 + 81 + 77 + 83 + x)/5 = 80 Combine the left
(316 + x)/5 = 80 Multiply by 5
316 + x = 80 * 5
316 + x = 400 Subtract 316
316 - 316 + x = 400 - 316
x = 84 <<<< Answer
She should get 84 in her fifth test to have an average of 80
(75 + 81 + 77 + 83 + x)/5 = 80
(316 + x)/5 = 80
[(316 + x)/5] (5) = 80(5)
316 - 316 + x = 400
316 + x = 400 - 316
x = 84
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