SOLUTION: Your test score in science are 83 and 87. What possible scores can you earn on your next test to have a test average between 85 and 90,inclusive?

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Question 815211: Your test score in science are 83 and 87. What possible scores can you earn on your next test to have a test average between 85 and 90,inclusive?
Found 2 solutions by josmiceli, MathTherapy:
Answer by josmiceli(19441)   (Show Source): You can put this solution on YOUR website!
Let = your score on the next test
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In order to have an 85 average, you need at least:




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In order to have an 90 average, you need at least:




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You need to score between 85 and 100 inclusive

Answer by MathTherapy(10552)   (Show Source): You can put this solution on YOUR website!

Your test score in science are 83 and 87. What possible scores can you earn on your next test to have a test average between 85 and 90,inclusive?


Let 3rd score be S
Then:
255 < 170 + S < 270 ------- Multiplying by LCD, 3
255 - 170 < S < 270 - 170
85 < S < 100
The 3rd score should be between 85 and 100, non-inclusive.
You can do the check!!
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