The sum of ages of 5 children born at the intervals of 3 years each is 60 years. What is the age of the youngest child?

Question: The sum of ages of 5 children born at the intervals of 3 years each is 60 years. What is the age of the youngest child?

Solution:
Let,
The ages of 5 children be x years, x + 3 years, x + 6 years, x + 9 years, x + 12 years

ATQ,
x + x +3 + x + 6 + x + 9 + x + 12 = 60
⇒ 5x + 30 = 60
⇒ 5x = 30
⇒ x = 30/5
∴ x = 6

∴ The age of the youngest child is = 6 years