Question

If from a group of 5 people, an old member is
replaced by a new one, the average age is
same as it was 3 years ago. What is the
difference between the ages of the old
member and the new one?
b. 15
a. 12
d. 1
C. 11
d. 18​

Answer 1

Answer:

Let the ages of the five members at present be a, b, c, d & e years.

And the age of the new member be f years.

Solving e - f = 15 years.

Thus the difference of ages between replaced and new member = 15 years.