Question

after 12 years I shall be 3 times as old as I was 4 years ago. find my present age

Answer 1

Let x be the present age
given after 12 yrs I would be 3 times of what I was 4 yrs ago so the equation is
$x + 12 = 3(x - 4) \\ x + 12 = 3x - 12\\ x - 3x = - 12 - 12 \\ - 2x = - 24 \\ 2x = 24 \\ x = 24 \div 2 \\ x = 12$
12 is the present age

Answer 2

Given :

• After 12yrs, I shall be 3 times as old as I was 4 years ago.

To Find :

• My Present age= ?

Solution :

Let my present age be x years.

After 12 years, my age will be (x + 12) years.

4 years ago , my age was (x - 4) years.

It is given that after 12 years I shall be 3 times as old as I was 4 years ago.

$\rm\therefore \: x + 12 = 3(x + 4) \\ \rm\implies \: x + 12 = 3x - 12 \\ \rm \implies \: x - 3x = - 12 - 12 \rm\\ \rm \implies \: - 2x = - 24 \\ \rm\implies \: \: x = \frac{ - 24}{ - 2} \\ \rm\implies \: \: x = 12 \\ \\ \sf \red{ \underline{ \: my \: present \: age \: is \: 12 \: years}}$