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The average age of four children in a family is 12 years. If the spacing between their ages is 4 years, the age of the youngest child is?

6 years
7 years
8 years
9 years

Correct Answer: 6 years

Explanation:

Let the age of youngest child be y.
so from question y + (y + 4) + (y + 8) + (y + 12) = 4 x 12
⇒ 4y + 24= 48
∴ y = 6 years

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