Current location - Training Enrollment Network - Mathematics courses - Nine Lake Central Primary School has 100 students who participated in the math competition, with an average score of 63, including 60 for boys and 70 for girls.
Nine Lake Central Primary School has 100 students who participated in the math competition, with an average score of 63, including 60 for boys and 70 for girls.
This problem is also a "chicken and rabbit in the same cage" problem.

Assuming that all female students take part in the competition, they can get 7000 points, which is 7000-6300 points more, because if male students are counted as female students, everyone will get 70-60 points more. In this way, we can calculate the number of male students, and then calculate the number of female students.

Calculation method: (70 *100-63 *100)/(70-60)

=700/ 10

=70 people

100-70=30 (person)