Question

In a class of 35 students, number of girls is 2/5 of number of boys. Find number of boys.

Answer 1

let no . boys =x
then no. girls =2/5(x)
so x+2/5(x)=35
  =7x/5=35
  =7x=35*5
  =x=35*5/7
  x = 5*5
 x =25
no. biys = 25 and n.girls=10

Answer 2

Concept:

Fraction: In mathematics, a number is defined as a quotient, in which a numerator is divided by a denominator.

Given:

There are a total of 35 students in a class.

The number of girls in the class is equal to two-fifth of the number of boys in the class.

Find:

The number of boys in the class.

Solution:

Let the number of girls in the class be g and the number of boys in the class be b.

Now the total number of students in the class is 35.

So, g + b = 35

Now, the number of girls is 2/5 of the number of boys in the class.

Therefore,

$g=\frac{2}{5} b$

$\frac{2}{5}b+b=35$

$\frac{7}{5}b=35$

$b=25$

The number of boys in the class of 35 students is 25.

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