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Lynn has 4 test scores in science class. Each test is worth 100 points, and Lynn has an 85% average. If Lynn scored 100% on each of the first 3 tests, what did she score on her 4th test?

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Question:

A
40%

explanation

To calculate the average, add all of the scores and divide by the total number of scores. Use the variable x in place of the missing score.

Let the score of the 4th test be "x"

Because Lynn scored 100% on 3 tests and the average score is 85%, we have:

(x + 100 + 100 +100)/4 = 85

(x + 300)/4 = 85

x+ 300 = 85 * 4

x + 300 = 340

x = 340 - 300

x = 40

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