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Algebra 7 Online
OpenStudy (anonymous):

Every student in the 6th grade at PS 500 must read exactly three of the principal's four favorite books. If 34 read Math for Fun, 36 read Everyone Loves Math, 38 read Cool Math, and 12 read Math is for Me, how many students are in the 6th grade at PS 500? (A) 30 (B) 40 (C) 60 (D) 90 (E) 120

OpenStudy (inkyvoyd):

If there are x students at PS500, then those x students must have read 3x books. That means, if you sum up all the books, and divide by 3, you will get x... because the total number of books (3x) is 3 times the number of students.

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