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If the mean age of combined group of boys and girls is 18 years and the mean of age of boys is 20 and that of girls is 16, then what is the percentage of boys in the group?
60
50
45
40
According to concept of mixture and allegation Thus, Percentage of Boys in the group =2 / (2+2) ×100 =2 / 4×100 =50 % Hence option (2)
By: Munesh Kumari ProfileResourcesReport error
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