How to do the last two questions on page 40 of the second volume of the fifth grade mathematics in the classroom exercise book?

The number of participants in the experimental primary school is 2800× 15%=420 (people).

Since the two primary schools have the same number of participants, Shuinan Primary School also has 420 participants.

420/1400×100% = 30% There are 30% students in Shuinan Primary School.

Similarly, it can be found that the number of students in Shuinan Primary School is 1/2 of that in the experimental primary school, and because the number of students in the two schools is the same, Shuinan Primary School has to expel 15%×2=30% students from the competition.

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