Find the age of the girl.

A girl is 28 years younger than her father. The sum of their ages is 50 years. Find the ages of the girl and her father.

In a school there are 20 girls. The average age of the girls is decreased by 2 months when one girl aged 18 years is replaced by a new girl. What is the age of the new girl?

The number of students in a class is 60 . The average of the ages of the boy-students is 14.5 years and the average of the ages of the girl-students is 16 years . If the collective average of the total students be 15 years , then find the number of boy-students and the number of girl-students.

The ratio of a girl and her younger brother is 10 : 9 , respectively. Ten years ago, their ages were in the ratio of 5 : 4 . Find the present age of the girl.

In a class, the number of boys and girls are distinct. The average age of all the student in the class equals the average of the average age of the boys and the average age of the girls. The sum of the average age of the boys and the average age of the girls is 10 years. Find the average age (in years) of the boys of the class

Ten years ago, a family had 8 members and the average of their ages then was 33 years. Four years later, a member died at age of 64 years and a boy was born, After three more years, another member died , at the age of 72 years and a girl was born. Find the present average age of this family (in years).

In a school,720 are boys and 40% are girls. Find the number of girls.

In a school, 720 are boys and 40% are girls. Find the number of girls.