From a survey of students, the number of students with a total of 30 people by male and female students as male students — 15 persons in grade 2, and the number of female students in grade 4.
The survey consisted of 30 students, with the number of male students and female students as male students is 15 people by the most in two years and the number of female students in the fourth grade.
The students were 30 people. The number of male and female students rate is 15 people. The male students most of the students 2 and the number of female students in first year, most 4