Average age of a family of 4 members was 19 years, 4 years back. Birth of a…

4 years ago → 4 members, average = 19 → total age = 4×19 = 76.

After 4 years → each of 4 grows by 4 → total increases by 4×4 = 16 → total now = 76 + 16 = 92.

Now 1 child born, total members = 5, and average remains 19.

So total age now should be 5×19 = 95.

Actual total = 92 + child’s age = 95 → child’s age = 3 years.

✅ Answer: 3 Years