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?


<pre>
Let 3rd score be S
Then: {{{85 < (83 + 87 + S)/3 < 90 }}}
        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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