Your test scores in one class are 81 and 89 . What possible scores can you earn on your next test to have a test average between 85 and 90 , inclusive?

Question

Your test scores in one class are 81 and 89 . What possible scores can you earn on your next test to have a test average between 85 and 90 ​, ​inclusive?

oobleck · Answer

85 <= (81+89+x)/3 <= 90 255 <= x+170 <= 270 85 <= x <= 100

Your test scores in one class are 81 and 89 . What possible scores can you earn on your next test to have a test average between 85 and 90 ​, ​inclusive?

Your test scores in one class are 81 and 89 . What possible scores can you earn on your next test to have a test average between 85 and 90 , inclusive?