Question

The sum of ages of three children born at the intervals of $5$ years each is $45$ years. What is the age of the youngest child?

• A. $4$ years
• B. $10$ years
• C. $5$ years
• D. $15$ years

Answer 1

The correct option is B $10$ years

Let the ages of children be $x,(x+5)$ and $(x+10)$ years.
Then, $x+(x+5)+(x+10)=45$
$\Rightarrow 3x+15=45$
$\Rightarrow x=10$
Hence, age of the youngest child $=10$ years