Question

Four years ago, the average age of four
friends was 21 years. Now, with a fifth
friend joining the group, their average has
become 24 years. What is the present age
of the new friend?
(1) 20 years
(2) 22 years
(3) 24 years
(4) 26 years​

Answer 1

Answer:

4 year ago the average age of 4 friends was 21 years.

Age addition was=4×21=84

84+4×4=

84+16

now 4 friends averaje is:100 years

now 5 friends average age is:24

Age addition is:24×5=120

Present age of the new friend is:Difference between age averages.

So,120-100=20

20 is present age of the new friend.

please like &Rate my answer.