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Urgent! ! ! ! ! ! ! ! ! ! ! Math needs answers before 22: 22! ! ! ! Thank you gods.
Let the number of participants be X and the number of skipping rope be Y, then x=9/4*y and the number of shooters be 5/8 * X; Because the number of participants in both competitions is 15, so:

5/8*x+y=x+ 15 explanation: (number of people who jump rope+number of people who shoot) = (number of people who participate in both competitions)

Because x = 9/4 * y；; Solvable: x=2 16, y=96.

So the number of students in the whole grade is: x/(75%)=288.

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