Milena has grades of 85 and 91 on her first two English literature tests. What must she score on her third test so that her average is at least 90?
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Let the score on her third test be $S_3$. The average of her three tests is given by the formula: $$ \text{Average} = \frac{S_1 + S_2 + S_3}{3} $$ Milena wants her average to be at least 90. This can be written as an inequality: $$ \frac{S_1 + S_2 + S_3}{3} \ge 90 Show more…
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