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September 15, 2014

September 15, 2014

Posted by **jack** on Wednesday, May 18, 2011 at 8:23pm.

- math -
**MathMate**, Thursday, May 19, 2011 at 9:30amFive tests with an average ≥70 means a total score of ≥ 5*70=350, but < 5*80 = 400.

He has already got:79 + 85 +81 + 65 = 310 points.

What should he get to score (x) between 350 and 400?

350 ≤ 310+x < 400

Subtract 310 from the above inequality to find the range of x.

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