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- What is the content of Beibei's mathematics?
What is the content of Beibei's mathematics?
Solution: If Beibei answers the X question correctly, she answers the wrong question (10-x).
10x-7( 10-x)=66
10x-70+7x=66
17x=66+70
17x= 136
x=8
Beibei answered eight questions correctly.
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