The sum of the ages of 5 children born at intervals of 3 years each is 50 years. What is the age of the youngest child?

4 years
8 years
10 years
None of these

Correct answer: 4 years

Solution

If the youngest child is \(x\), the ages are \(x, x+3, x+6, x+9, x+12\). Their sum is \(5x+30=50\), so \(x=4\). Hence, the youngest child is 4 years old.

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