Quote: "Grinya"
I don't think that a second may be correct because "totk" is written with the letters, not just figures.
There is also a possibility that the whole result of double "totk" shall be shifted by six, not every figure in it.
So a correct answer may be 12
About the second proposition, we should thing like that :
The way we wrote the world "box" change when you encrypt it, but we still talk about a 9 faces object. Even if we encript it, the shape of the object stay the same.
If we start at 6 (0 in decimal) and count until 86 (20 in decimal) like that, it will be : six, seven, eight, nine, zero, one, two, three, four, five, seventy (or seventy six ? Depend the prononciation of "76" here), seventy seven, seventy eight, seventy nine, seventy zero (or seventy ?), seventy one, seventy two, seventy three, seventy four, seventy five, eighty (or eighty six ?).
I'm noticing I made an error with this one : the answer would be 6 in decimal, or "2" / "zcu" encrypted
However, I agree there is a problem with this concept because of the definition and etymology of the words we use for the numerals : it's the reason why I didn't chose this answer in my first comment.
12 can work, indeed ; I didn't think about this possibily ahah
Quote: "ashlobo"
In that case, since the examiner doesn't care, I'll copy off someone who looks like he/she knows what this is all about
... my new better thought out answer is now 52 
What if I'm just a puppet and someone ordered me to confuse you to orientate your answers in the wrong directions ?

Maybe the correct answer was 98 after all ?
Anyway, the answer is twelve and "6" is correct.