A Wicked Math puzzle

[Shrek3]

This is a simple but wicked puzzle which would scratch the grey matter for a while.
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Here is the matrix for the judgement:

* If you're a Math Teacher, you should be able to solve it in under 60 seconds
* if you're a Detective, in 2 minutes
* if you're a Pilot, in 3 minutes
* if you're a Doctor, in 5 minutes
* if you're an Accountant, in 10 minutes
* if you're a Lawyer, in 30 minutes
* if you're a Salesman, in 1 hour
* If you're a Politician or a Blonde, probably never!

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[ARAB PRIDE عربي]

Your answer is correct in 0.42 minutes. And you should be a Math Teacher.

any way i don't like to be a math teacher hehehe

 

[itcouldbeme]

I'm a big open source fan... :anonymous

The answer is 13...

 

[maildude]

Got it in about two minutes.:hatsoff:

 

[Legzman]

I'm a big open source fan... :anonymous

The answer is 13...

in that case I got it in 1 second!!!!!!