a) 4 years
b) 8 years
c) 10 years
d) None of these
Answer: a
Explanation: Let the ages of children be x, (x + 3), (x + 6), (x + 9) and (x + 12) years.
x + (x + 3) + (x + 6) + (x + 9) + (x + 12) = 50
5x = 20
x = 4
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