Question

Part Mathematics
36. In a music school 70% students are boys: If the total number of girls is 255.
Find out the number of the boys?​

Answer 1

Answer:

645

Step-by-step explanation:

if boys are 70% girls must be 30%

let no of boys be x

Answer 2

Answer:

Number of boys in the music school = 595

Step-by-step explanation:

Given :

Percentage of boys are in music school = 70%

Number of girls = 255

To find :

The number of boys

Taken :

To find the number of boys in the music school use this formula -:

$\boxed{\rm{N_{boys}=\dfrac{P_{boys}}{P_{girls}}\times N_{girls}}}$

Here , " N " means number . And " P " means percentage .

And the percentage of girls -:

= 100%-70%

= 30%

Solution :

$\leadsto\rm{N_{boys}=\dfrac{70\%}{\cancel{30\%}}\times\cancel{255}}$

$\leadsto\rm{N_{boys}=\dfrac{\cancel{70\%}}{\cancel{2}}\times17}$

$\leadsto\rm{N_{boys}=35\times17}$

$\leadsto\rm{N_{boys}=595}$

So , the number of boys in the music school is 595 .