Skylar's grades on four math tests are 85, 78, 77, and 69. what does skylar need to score on the next test in order to have a mean score of 80?

Hello there.

Skylar's grades on four math tests are 85, 78, 77, and 69. What does Skylar need to score on the next test in order to have a mean score of 80?

85 + 78 + 77 + 69 = 309.
80 x 5 = 400.
400 - 309 = 91.
She needs to score 91.

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