Question

^)
4) There are 12% boys in a school. If the number
of boys is 36 find:
(i) the number of girls
(ii) the total number of students​

Answer 1

Answer:

Total number of students in the class=36

Number of girls in the class =x

Number of boys in the class=2x

x+2x=36

3x=36

x=12

Number of girls=12

Number of boys 2x=24

Sarita's rank in the class is 19th. There are 13 boys ahead of her. Therefore, there are 5 girls ahead of her.

Therefore, number of girls behind sarita 12−5−1=6

Answer 2

Answer:

Given :

$\textsf{Percentage of boys in the school = 12 \%}$

$\textsf{Number of boys in the school = 36}$

To find :

$\textsf{(i) The number of girls }$

$\textsf{(ii) The total number of students in the school}$

Concept :

To find the total number of girls in the school . First find number of students in the school . Then subtract it from number of boys in the class . After , that we will get the number of students and number of girls in the school .

So , to find the total number of students in the school . Use this equation.

$\sf\boxed{N=\dfrac{100\%}{B\%}\times\:B}$

Where,

N = Total number of students

B % = Percentage of boys in the school

B = Total number of boys in the school

Solution :

$:\implies\sf{N=\dfrac{100\%}{12\%}\times36}$

$:\implies\sf{N=100\times3}$

$:\implies\sf{N=300\:students}$

So , total number of students in the school is 300 .

Number of girls :

$:\implies\sf{G=N-B}$

$:\implies\sf{G=300-12\:students}$

$:\implies\sf{G=288\:girls}$

Answer :

So ,

(i) Number of girls = 288

(ii) Total number of students = 300 students