Gabrielle has already taken 81 quizzes during past quarters, and she expects to have 1 quiz during each week of this quarter. How many weeks of school will Gabrielle have to attend this quarter before

Gabrielle has already taken 81 quizzes during past quarters, and she expects to have 1 quiz during each week of this quarter. How many weeks of school will Gabrielle have to attend this quarter before she will have taken a total of 90 quizzes?

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