The last common sense is: 88*2-90*2-(87*2-x)
From the last condition (the score of common sense is known to be higher than that of Chinese 10), 88*2-90*2-(87*2-x)-x= 10.
The solution of this one-dimensional linear equation is: x=80.
So the math is: 94.
Language: 80
English is: 86
Common sense: 90
Total score: 350, average score 87.5.
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