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- The sixth grade elementary school mathematics innovation class exercises 79 pages of answers.
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.
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