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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.
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