In a class of 400 students 30% are girls.find the number of boys?
80
well, 70% are boys, right?
.70 * 400 = ?
To get the number of boys in the class, we first need to find the number of girls in the class, which is 30% of the total number of students.
To do this, we calculate 30% of 400:
30% = 30/100 = 0.3
Number of girls = 0.3 * 400 = 120
Now, to find the number of boys, we subtract the number of girls from the total number of students:
Number of boys = Total number of students - Number of girls
Number of boys = 400 - 120 = 280
Therefore, there are 280 boys in the class of 400 students.