The total number of students in a class is 24 more than that of boys and 21 more than that of girls I feel it's the same. It seems too simple

I think what you want is not just an answer, but a whole equation step
The total number of a class is X
Because x-boys = 24, then the extra 24 are girls
X-girls = 21, so the more people are Ansheng
So 21 boys + 24 Girls = 45

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