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September 15, 2014

September 15, 2014

Posted by **Kahlil** on Wednesday, November 9, 2011 at 6:14pm.

- Algebra -
**Steve**, Wednesday, November 9, 2011 at 8:39pmIf Newton had 20 students and Euclid had e students,

total points = 20*90 + e*80

total students = 20+e

total average = (20*90 + e*80)/(20+e) = 85

1800 + 80e = 1700 + 85e

100 = 5e

e = 20

Makes sense. 85 is halfway between 80 and 90, so there must have bee the same number of students in each class.

- Algebra -
**Daniel**, Thursday, November 8, 2012 at 6:46pmLuisa mows lawns during the summer. She charges $15 if she cuts the grass but charges $5 more if she also trims the grass. Last week she trimmed 5 more yards than she cut. If she made $415 last week, how many yards did she trim?

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