Question

Ina a class of 35 students, the number of girls is 2/5 of the boys.find the number of boys in the class.
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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. boys = 25 and no. girls=10

Answer 2

$\huge\bf\red{\underline{\underline{Solution:-}}}$

$\tt{No. \: of \: students \: in\: class = 35}$

$\tt {No. \: of \: girls\: in \: class = \frac {2}{5}}$

$\tt {No. \: of \: boys \: in \: class = x}$

$\tt { x + \frac{2}{5} = 35 } \\ \\ \tt {\frac {7x}{5}= 35} \\ \\ \tt { x = 35\times \frac{5}{7}} \\ \\ \tt {x = 5×5} \\ \\ \tt {x = 25}$

$\tt\blue{No.\:of \: boys \: in\: class = 25}$