The number of male students in a class accounts for 25% of the total number of students in the class, and there are 24 female students in the class

The number of male students in a class accounts for 25% of the total number of students in the class, and there are 24 female students in the class

Male students account for 25% of the class, female students account for 75% of the class, 24 △ 75% = 32 (people)

There are 120 students in grade one of Guangming primary school, and three-quarters of them are just 60% of the students in grade two. The number of students in grade two is several percent more than that in grade one

120*4/3=90
90 divided by 60% = 150
(150-120) divided by 120 = 25%

There are 42 students in the sixth grade interest group, 47 of whom are boys. Later, there are several girls. At this time, the ratio of boys to girls is 6:5. How many girls are there in this interest group now?

6 + 5 = 1142 × 47 ﹣ 611 × 511 = 24 ﹣ 611 × 511 = 44 × 511 = 20 (people) a: now there are 20 girls in this interest group

There are 324 students in the fifth and sixth grades of a primary school. In the fifth grade, boys account for 5 / 9, and in the sixth grade, boys account for 4 / 9
Q: how many students are there in each of the two grades
Remember,

Let the number of students in grade five be X. according to the meaning of the question, the equation is: X (1-5 / 9) = (324-x) (1-4 / 9)
The equation uses the number of girls in Grade 5 (4 / 9x) = the number of girls in Grade 6 (the total number of girls in Grade 5 and 6 - the number of girls in Grade 5) * 5 / 9
The solution is: x = 180
The number of sixth grade students: 324-180 = 144