Mela earned scores of 75, 70, 92, 95 and...

Mela earned scores of 75, 70, 92, 95 and 97 points (a total of 429 points) on the first 5 tests in Economics II. Solving which of the following equations for s gives the score he needs to earn on the 6th test to average exactly 85 points for all 6 tests?

`429/5 + s = 85`

`429/6 + s = 85`

`(s + 429)/5 = 85`

`(s + 429)/6 = 85

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