The average age of 25 boys in a class decreases by 6 months, when a new boy takes the place of a 20 yr old boy. Find out the age of new boy.

There were 20 boys in a class. The average age increase by 2 months, as a new boy comes in a place of a boy aged 18 years. The age of new boy is?

The average age of 30 women decreases by 3 months if a new person Priyanka is included in place of a 25 yr old woman. Calculate the age of Priyanka.

The average age of 15 boys in a class is 11 years 3 months. If A boy of 12 years and 7 months join that class, what will be the average age of the boys in the class?

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.

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