Posted by Kahlil on Wednesday, November 9, 2011 at 6:14pm.
If 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.
Luisa 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?
Luisa 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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