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Lu's math score on her achievement test in seventh grade was a 650. Her math teacher told her that her test score level went up by 25% from her sixth grade test score level. What was Lu's test score level in sixth grade? Show your work.

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[tex]x=Lu's\ grade\ in\ sixth\ grade. \\ x* \frac{125}{100} =650 \\ x=650* \frac{100}{125} \\ x= \frac{(650)(100)}{125} = \frac{65000}{125} \\ \boxed{x=520} [/tex]
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