We are given
total number of boys attending state=475
and the part of boys play instrument is
[tex]=\frac{18}{25}[/tex]
so,
Number of boys attending boy state play an instrument = ( the part of boys play instrument )*( total number of boys attending state)
so, we can plug values
and we get
Number of boys attending boy state play an instrument is
[tex]=\frac{18}{25}\times 475[/tex]
[tex]=342[/tex]
So,
Number of boys attending boy state play an instrument is 342.......Answer