Question

В классе 30 учеников, из них 30% девочки. сколько мальчиков в классе?​

Answer 1

Ответ:

30%=0.3

1-0.3=0,7 - это мальчики

Если 100% это 30

То 30% = x

x=30*30/100=9 - это девочки

Значит 30-9=21 (мальчик)

Answer 2

To find out how many boys are in the class, we first need to calculate the number of girls in the class, given that 30% of the students are girls.

Step 1: Calculate the number of girls in the class: Number of girls = 30% of 30 (total number of students) = 0.30 * 30 = 9

Step 2: Calculate the number of boys in the class: Number of boys = Total number of students - Number of girls = 30 - 9 = 21

So, there are 21 boys in the class.