The average age of a group of 8 persons is 40 years. A person aged 60 years leaves the group and another person aged 44 years joins the group. The new average age of the group is

Average age of a group of 30 boys is 16 years. A boy of age 19 leaves the group and a new boy joins the group. If the new average age of the group is 15.8 years, find the age of the new boy.

The average age of a group of 36 students is 23 years. 4 students leave the group whose average age is 22 years. What is the average age of new group in years ? ( Correct to one decimal place ). 36 छात्रों के समूह की औसत आयु 23 वर्ष है | 22 वर्ष की औसत आयु वाले 4 छात्र समूह छोड़ देते हैं | नए समूह की औसत आयु वर्षों में (एक दशमलव स्थान तक) कितनी है ?

The average age of a group of persons going for picnic is 16 years. Twenty new persons with an average age of 15 years join the group on the spot due to which their average age becomes 15.5 years. The number of persons initially going for picnic is (a) 5 (b) 10 (c) 20 (d) 30

The average age of a group of persons going for picnic is 16 years. Twenty new persons with an average age of 15 years join the group on the spot due to which their average age becomes 15.5 years. The number of persons initially going for picnic is

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.

The average of the ages of a group of 65 men is 32 years. If 5 men join the group , the average of the ages of 70 men is 34 years. Then the average of the ages of those 5 men joined later (in years) is :

The average age of a group of men and women is 30years.If average age of men is 32and that of women is 27, then the percentage of women in the group is-

The average age of a group of 4 friends is 36 years. The youngest friend amongst them is 6 years old. What was the average age of the group at the time of the birth of the youngest friend?