# algebra

Jacob has a mean score of 78 after his first four math tests. He wants to make a B, or an average of 80, in math. What does he need to score on the fifth test to have a mean score of 80?

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3. 👁 378
1. 80 * 5 = 400

78 * 4 = 312

400 - 312 = 88

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