In a class of 35 students, the number of girls is two-fifth of the number of boys. Find the number of girls in the class.

Explanation: Total number of students in a class 

Let the number of girls = x

Let the number of boys = y

Then according to the question;

Total number of students are , therefore;

x + y = 35.......(i)

The number of girls is two-fifth of the number of boys, therefore;

x = 2y/5

From equations (i) & (ii);

2y/5 + y = 35

7y/5 = 35

y = 35 x 5/7

y = 25

From equation(i);

x + 25 = 35

x = 35 - 25

x = 10

Therefore, the number of girls in the class are 10.

Final answer: Hence, we concluded that the number of girls in the class are 10.