The average age of two boys and their father is greater than the average age of those two boys and their mother by 3 yr. The average age of the four is 19 yr, If the average age of the two boys be `5 1/2` yr, then find the age of the father and mother.

The average age of two boys and their father is greater than the average age of those two boys and their mother by 3 yr . The average age of the four is 19yr. If the average age of the two boys be 11/2 yr , then the age of the father and mother.

The average age of 9 students and their teacher is 16 yr. The average age of the first four students is 19yr and that of the last five is 10 yr. The teacher's age is

The average age of three boys is 16 years. If their ages are in the ratio 4:5:7, then the age of youngest boy is

The average age of r boys in a class is a years. If the average age of s of them is b years, them what is the average age of the remaining boys ?

The average age of three boys is 15yr . If the ratio of their ages is 3:5:7 , what is the age of the oldest boy ?

In a colony, the average age of the boys is 14 years and the average age of the girls is 17 years. If the average age of the children in the colony is 15 years, find the ratio of number of boys to that of girls.

The average age of 5 boys is 20. If the average age of 4 of them is 18, find the age of the fifth boy.

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