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In a class, 20% of the boys have blue eyes and 10% of the girls have blue eyes. If the ratio of boys to…

Take boys as 4x and girls as 3x, so the class has 7x students. Blue eyed students number \(0.20(4x)+0.10(3x)=0.8x+0.3x=1.1x\). The required fraction is…

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In a class, 20% of the boys have blue eyes and 10% of the girls have blue eyes. If the ratio of boys to girls in the class is 4:3, then what is the portion of the students in the class having blue eyes?

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Take boys as 4x and girls as 3x, so the class has 7x students. Blue eyed students number 0.20(4x)+0.10(3x)=0.8x+0.3x=1.1x0.20(4x)+0.10(3x)=0.8x+0.3x=1.1x. The required fraction is 1.1x7x=1170\frac{1.1x}{7x}=\frac{11}{70}.

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