Hope that there are 450 students in primary school, and the number of girls is 80% of the number of boys. How many boys and girls are there?

Hope that there are 450 students in primary school, and the number of girls is 80% of the number of boys. How many boys and girls are there?

Take the number of boys as one, so the number of girls is 80%
The number of boys is 450 (1 + 80%) = 250
Girls are 450-250 = 200

There are 750 students in Guangming primary school. The number of boys is 1.5 times more than that of girls. There are 30 students in Guangming primary school

There are x girls
1.5X+30+X=750
2.5X=720
X=288
Female = 288
Male = 750-288 = 462