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Mathematics 21 Online
OpenStudy (anonymous):

Tue’s math teacher gave 20 four-question pop-quizzes throughout the first semester. Tue remembered that she scored either 75% or 100% on all of the quizzes. If her average quiz grade for the semester is 90%, how many of each score did she earn?

OpenStudy (perl):

|dw:1386928061004:dw|

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