CUM???!!!

[M_TM]

http://bored.com:8080/mysticalball/
...exista o explicatie...?

[shpeedy]

Poate asta te ajuta:

So how does it work?
Note: Before proceeding, atleast make an attempt to solve it yourself.

Consider the numbers in the list. Now apply the Math you are asked to perform in the puzzle for all numbers from 10 to 19..

10 - (1 + 0) = 9
11 - (1 + 1) = 9
19 - (1 + 9) = 9

This will surely enlighten you. Amazingly, the answer is always nine.
Why is the answer always the same? That would be a dumb question.
Anyway, here's the answer.
Let's take from the samples shown above.
The original numbers always increment by one (10,11,12....19), but so does the values we are using to subtract ( 1+0,1+1,1+2...1+9).
Obviously, it will yield the same number.

Now consider all numbers between 20 and 29..
20 - (2 + 0) = 18
21 - (2 + 1) = 18
Its 18 here.
And how is 18 related to 9 ? Its a multiple of 9 offcourse.

Similarly, for the set 30-39, it will be 27. 27 is another multiple of 9.
40-49 will return 36.

Now take a close look at the symbols for the number 9 and its multiples.
Well! You must have guessed it by now. All the symbols are the same and this is the answer.

It is truly the magic of the number 9.

[bogdanb]

Aveam prin clasa a 5-a o carte, parca "Matematica distractiva", plina cu exercitii pe baza de curiozitati din astea  . In loc sa fac temele la mate pe bune pentru scoala, stateam cu orele la exercitiile din cartea aia