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There were 300 students in Huimin primary school. The number of girls increased by 5% and that of boys by 4% this semester. The total number of students increased by 13. How many girls were there?
If there are x female students, there will be 300-x male students
5%x+(300-x)4% = 13
1%x = 1
X = 100 people
(boys: 300-100 = 200)
A: there were 100 girls
Arithmetic:
(13-300x4%)÷(5%-4%)=100
Sunshine primary school organizes summer camp activities. There are 130 boys, 1 / 12 more than girls. How many people participate in summer camp?
If the number of female students is x, then 130-x = 1 / 12x, and x = 120, the total number of summer camp is 250
In the summer camp, 112 more boys than girls take part, and the number of girls is three fifths of boys. How many boys and girls are there respectively
Setting: there are x boys and (x-112) girls
(X-112)/X=3/5
There are 280 boys and 168 girls
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