the mena age of combined group of men and women is 30 years .if the mean age of men and women are respectively 32 and 27 then the percentage of women in the group is?
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B
80, 20
Let total no. of people in the group be 100 and out of them x are men
i.e no of women = 100−x.
Mean age =
no of people
sum of ages in the group
Total sum = sum of ages of men + sum of ages of women
⇒100×25=x×26+(100−x)×21
⇒x=80
Hence, the percentage of men and women in the group is 80,20 respectively
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