(38+37+3 1)-(2 1+ 17+X)= 50
The solution is X= 18.
Answer: The total number of people participating in football and table tennis is 18.
38+37+3 1, the number of people who take part in football and basketball, basketball and table tennis, table tennis and football at the same time has tripled, so subtracting (2 1+ 17+X) is exactly 50 students in the class. Only need to solve x)
I am a senior two student.
I really haven't seen such a problem in high school (we are in the curriculum reform area). It seems to be an Olympic math problem in our primary school.