The average of class is 14.8 years.the average of boys in class is 15.5 and the average of girls in classis 14.4.then what is the average ratio of boys to girls is
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let no of boys be x and no of girls be y...then x(15.5)+y(14.4)/x+y=14.8...so 0.7x=0.4y....so ratio is 4:7
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