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- 20 17 Grade 3 of Yanshan Ermo Mathematics
20 17 Grade 3 of Yanshan Ermo Mathematics
Solution: If she did X right, then she did it wrong or didn't do it (20-x). According to the meaning of the question:
5x-2 (20x) =79
5x-40+2x=79
7x= 1 19
x= 17
So she got 17 right.
A: She got it right 17.
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