Answers with Explanation:
Let the ages of children be x, (x + 3), (x + 6), (x + 9) and (x + 12) years.
Then, x + (x + 3) + (x + 6) + (x + 9) + (x + 12) = 50
5x + 30 = 50
5x= 50-30 which is equal to 20
Therefore, 5x = 20
x = 4.
Age of the youngest child = x = 4 years.