Question

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 ​

Answer 1

$\huge\boxed{\fcolorbox{pik}{pink}{Answer:}}$

${\fcolorbox{pin}{yellw}{Let the number of girls = g}}$

${\fcolorbox{pin}{yellw}{Let the number of boys = b}}$

${\fcolorbox{pin}{yellw}{total \: no \: of \: students = 35}}$

${\fcolorbox{pin}{yello}{so \: g + b = 35...(1)}}$

${\fcolorbox{pin}{yello}{the no of girls = two - fifth \: of \: the \: no of \: boys}}$

${\fcolorbox{pin}{yello}{so \: g = 52b...(2)}}$

${\fcolorbox{pin}{yello}{from \: (1) and \: (2)}}$

${\fcolorbox{pin}{yello}{52b + g=35}}$

${\fcolorbox{pin}{yellw}{5b = 35}}$

${\fcolorbox{pin}{yellw}{57b = 35 }}$

${\fcolorbox{pik}{yello}{b = 735 x 5}}$

${\fcolorbox{pin}{yello}{b = 25}}$

${\fcolorbox{pin}{yello}{now \: from \: (1)....}}$

${\fcolorbox{pin}{yello}{g + 25 = 35}}$

${\fcolorbox{pik}{yello}{g = 35 - 25 = 10}}$

${\fcolorbox{pink}{pink}{Therefore, the no. \: of \: girls \: in \: the \: class = 10}}$

Answer 2

ANSWER:-

Let the number of girls = g

Let the number of boys = b

total no of students = 35

so g + b = 35...(1)

the no of girls = two - fifth of the no of 

boys.

so g = 52b...(2)

from (1) and (2)

52b + g=35

5b = 35

57b=35

b = 735 x 5

b = 25

now from (1)....

g + 25 = 35

g = 35 - 25 = 10

Therefore, the no. of girls in the class = 10