The mean age of a combined group of men and women is 25 years. If the mean age of the group of men is 26 years and that of group that of women is 21 years, then find the percentage of men and women in the group.

The mean age of a combined group of men and women is 30 years. If the means of the age of men and women are respectively 32 and 27, then the percentage of women in the group is

The sum of ages of father and his son is 75 years. If the age of the son is 25 years, find the age of the father.

The mean age of 40 students is 16 years and the mean age of another group of 60 students is 20 years. Find out the mean age of all the 100 students combined together.

The average age of a group of 8 persons was 14 years.A person with age 28 years left the group and a new person with age 16 years joined the group.Find the new average age of the group.

The sum of ages of a boy and his brother is 25 years, and the product of their ages in years is 126. Find their ages.

The average (arithmetic mean) age of the people in a certain group was 35 years before one of the members left the group and was replaced by someone who is 12 years older than the person who left. If the average age of the group is now 37 years, how many people are in the group?

The mean income of a group of workers is bar(X) and that of another group is bar(Y) . If the number of workers in the second group is 10 times the number of workers in the first group, then the mean income of the combined group is

8 men or 6 women earn Rs. 960 in one day. One day's earning of 4 men and 5 women.

The ratio between the number of men and women in an office is 5: 7. If the number of women working in the office is 42, find the number of men working in the office.

A particular work can be completed by 6 men and 6 women in 24 days, whereas the same work can be completed by 8 men and 12 women in 15 days. Find : The time taken by 4 men and 6 women to complete the same work.