Question

In 20 years Mark will be three times as old as he was 10 years ago how old is he

Answer 1

Answer:

Age of Mark is 25 years.

Step-by-step explanation:

Let the current age of Mark = x years

After 20 years, age of Mark=(x+20) years

10 years ago,age of Mark was (x-10) years.

In 20 years Mark will be three times as old as he was 10 years ago.

=> $\[(x+20) = 3*(x-10)\]$

=> $\[(x+20) = 3x-30\]$

=> $\[(3x-x) = 30+20\]$

=> $\[(2x) = 50\]$

=> $\[x = \frac{50}{2}\]$

=> $\[x = 25\]$