The average of a group of 16 persons is 28 yrs and 3 months. Two persons each 58 yrs old left the group. The average of the remaining persons is ?

The average age of 30 students of a class is 12 yr. The average age of a group of 5 of the students is 10 yr and that of another group of 5 of them is 14 yr. what is the average age of the remaining students ?

Five years ago, the average of the ages of 4 persons was 40 years. If a new person joins the group now, then the average of the ages all five persons is 46 years. The age of the fifth person (in years) is:

Blood group A person can

The average age of group of 20 girls is 15 yr and that of another group of 25 boys is 24 yr. The average ageof the two groups mixed together is

The average income of a group of 9 workers is Rs 137.30 and that of another group of 7 workers is rs 95.06. The average income of all the persons is:

Average age of a group of 10 children is 12 years. If a child leaves the group, then the average of remaining 9 children becomes 11 years. What is the age (in years) of the child who left the group?

The average income of a group of persons is vec x and that of another group is vecy. If the number of persons of both group are in the ratio 4 : 3, then average income of combined group is:- (1) (vec x + vec y)/7 (2) (3vec x + 4 vec y)/7 (3) (4 vec x + 3vec y)/7 (4) Non of these

The average age of a group of persons going for a picnic is 16.75 years. 20 new persons with an average age of 13.25 years join the group on the spot due to which the average of the group becomes 15 years. Find the number of persons initially going for the picnic.