Question

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

Answer 1

let the present age be x
x+12=3(x-4)
x+12=3x-12
12+12=3x-x
24=2x
x=24/2
x=12
present age is 12 years

Answer 2

Heya Friend!!!!

Here is your answer.....
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After 12 years: +12
3 times: *3
4 Years ago: -4
Present Age: x (unknown no.)

x + 12 = 3 * (x - 4)
x + 12 = 3x - 12 
3x - x = 12 + 12
2x = 24
x = 24 / 2
x = 12

These are the steps...
Please check once more time...

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Hope this helps you....

Thanks @ Jeferson ™