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Question.
The
The average age of combined group of males and females in a party is 20 years. If the average age of males is
23 years and that of females is 19 years, the percentage of females in the party is:​

Answer 1

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 peoplesum 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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