The sum of ages of 5 children born at the intervals of 3 years each is 55 years. What is the age of the youngest child? Choose the correct answer: A) 5 years B) 4 years C) 6 years D) 7 years E) 8 years
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) = 55   5x = 25   x = 5.   Age of the youngest child = x = 5 years.   5 years)
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The sum of ages of 5 children born at the intervals of 3 years each is 55 years. What is the age of the youngest child?