Problema Solution
Nina received grades of 85, 79, 87, 92, and 70 on five unit tests. The final examination is worth three times as much as one unit test. What must Nina get on the final examination in order to average 85 on all of her tests?
Answer provided by our tutors
let x = the grade on the final examination
(85 + 79 + 87 + 92 + 70 + 3x)/(5 + 3) = 85
by solving we find
x = 89
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Nina must get 89 on her final examination.