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Fraction of math x
The average score of five subjects is (92+80+96+90) ÷ 4+6 ÷ 4 = 358 ÷ 4+6 ÷ 4 = 91.

Math test 9 1+6=97.

Explanation:

Add 6 points (multiple shifts) higher than the average score of five subjects except mathematics, and each subject will increase by 6÷4 points on average.

Five families are divided into (92+80+96+90)÷4+6÷4 on average.