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The sixth grade elementary school mathematics innovation class exercises 79 pages of answers.
Suppose the number of students in the whole grade is X, the number of participants is 40%, and the number of gymnasts is 2/5 times 40% X.

Tug of war is 3/4 times 40% x.

Then it is: 40%X=2/5 times 40%X+3/4 times 40%X- 12 to get X=200.