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Let Ravita's score be x out of 30. We first form an equation based on the information provided in the question. The equation turns out to be 9(x+10)=x^2 -> x^2-9x-90=0 -> (x-15)(x+6)=0 SO, the possible values of x are x= 15 or -6. As we can ignore -6 (why?), this tells us Ravita score 15 in her...

read more Let Ravita's score be x out of 30. We first form an equation based on the information provided in the question. The equation turns out to be 9(x+10)=x^2 -> x^2-9x-90=0 -> (x-15)(x+6)=0 SO, the possible values of x are x= 15 or -6. As we can ignore -6 (why?), this tells us Ravita score 15 in her Math test. read less

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