Question

3. The average age of a family of 4 members, 4 years back was 19 years. Now, there's a new child added to the family and this has
kept the average age of the family the same. How old is the child recently added to the family?​

Answer 1

Answer:

Child recently added to the family is 3 years old currently

Step-by-step explanation:

4 years back

average age of a family of 4 members = 19 years.

(age 1 + age 2 + age 3 + age 4) / 4 = 19

age 1 + age 2 + age 3 + age 4 = 76 .............................. equation 1

Now, there's a new child added to the family and this has  kept the average age of the family the same.

(age 1 + 4 + age 2 + 4 + age 3 + 4 + age 4 + 4 + age 5) / 5 = 19

age 1 + age 2 + age 3 + age 4 + age 5 + 16 = 95

age 1 + age 2 + age 3 + age 4 + age 5 = 79

76 + age 5 = 79

age 5 = 3 years