Question

Twenty years from now, Arjun will become three times as old as he is now. His present age is ___ years.

Answer 1

Let Arjun's present age be $x$ years.

After $20$ years, his age will be $(x+20)$ years.

According to question,

$x+20=3x$

$\Rightarrow 3x-x=20$

$\Rightarrow 2x=20$

$\Rightarrow x=\frac{20}{2}$

$\Rightarrow x=10$

Therefore, Arjun's present age is $10$ yrs.