Math problem: 37 people completed Chinese homework, 42 people completed math, and 365,438+0 people completed both. How many people are there in this class?

Total number of people who have finished writing Chinese or math: 37+42=79.

Among them, 3 1 person is both completed, which is duplicate, and it needs to be subtracted: 79-3 1=48 people.

So the total number of people is: (37+42-3 1)=48.

(Premise: the number of students who have not finished both homework in the class is 0, and if there are n students who have not finished both homework, the total number is 48+n)

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