Question

if 70% of the student in a school are boys and the number of girls is 540 find the number of boys in the school​

Answer 1

Answer:

Number of boys = 1260

Step-by-step explanation:

Given :

Percentage of boys = 70%

Number of girls = 540

Percentage of girls = 100%-70% = 30%

To find :

Number of boys

Taken :

To find the number of boys use this formula -:

$\boxed{\sf{N_{b}=\dfrac{P_{b}}{P_{g}}\times\:N_{g}}}$

Where,

$\sf{N_{b}=Number\:of\:boys}$

$\sf{N_{g}=Number\:of\:girls}$

$\sf{R_{b}=Ratio\:of\:boys}$

$\sf{R_{g}=Ratio\:of\:boys}$

Solution :

$:\implies\sf{N_{b}=\dfrac{70\%}{\cancel{30}\%}\times\cancel{540}}$

$:\implies\sf{N_{b}=70\%\times18}$

$:\implies\sf{N_{b}=1260}$

So , the number of boys are 1260 .