Natasha wants to average at least 90% in math class. Her test scores so far are 94%, 89%, 88%, 92% and 85%. What score does she need on her next test to reach her goal?

Let's set up the problem

Start with an inequality~

(94+89+88+92+85+x) / 6 ≥ 90

448 + x ≥ 540

x ≥ 92

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