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In a math exam, the average grade of the whole class was 9 1.2. It is known that girls are 2 1, with an average of 92 points and boys are 90.5 points. How many boys are there in this class?
92-9 1.2=0.8 (points), and girls exceeded the average score by 0.8 points.

0.8×2 1= 16.8 (points), the total score of girls is higher than the average score 16.8, that is, the total score of boys is lower than the average score 16.8.

9 1.2-90.5=0.7 (points), and the average difference between each boy and the average score is 0.7 points.

16.8÷0.7=24 (person)

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