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QThe average score of girls in class X examination in a school is 73 and that of boys is 71.The average score in class X of that school is 71.8.Find the percentage of the number of girls and boys in class X of the school?

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Let the number of boys in the class be x and the number of girls be y,

Then, 71x+73y=71.8(x+y)

->0.8x=1.2y

Percentage of boys=[x/(x+y) ×100]%

=[3/2y/(3/2)y+y×100]%

=( 3y/2×2/5y×100) %

=60%

Percentage of girls =(100%-60%)

=40%

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