Gabriel had scores of 82, 85, 87, and 92 on his typing tests. What is the lowest score he can get on his next test and have an average of at least 87?

Explanation

You know that the mean of his 5 scores must be at least 87.
Multiply 5 and 87 to get the total of his scores for the 5 tests (the total needed to get a mean of 87).
\(5 \times 87=435\)
Add the 4 scores that you know.
82+85+87+92 = 346 (total of 4 scores)
Subtract to find the unknown score.
435 – 346 = 89

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