> After that, I will pick the comments with valid answers and draw lots for a winner who will win 1 SBI share. @freedomshift, would you like to sponsor a second winner?

Are you sure that there will be even one winner? 

Can a "second winner" just copy the answer of the first?

23 = 2 * 7 + 9

----------
case | formula | result | comment
--- | --- | --- | --- |
1  | 3 * 8 - 5 | 19 | n1 * n3 - n3D
2  | 4 * 6 - 2 | 22 | n1 * n3 - n3D
3  | 2 * 9 + 7 | 25 | n1 * n3 + n1D
4  | 1 * 5 + 4 | 9 | n1 * n3 + n3U
5  | 2 * 7 + 9 | 23 | n1 * n3 + n3U

My rules -
- the pentagon in the middle holds the answer
- the sequence of calculation is top left to top right >= multiply the first two numbers
- each number in each vertice is used once only
- the result is obtained by either 
- - n1 * n3 - n3D (going down) or
- - n1 * n3 + n3U (going up) or
- - n1 * n3 + n1D (going down but cross back from p3 to p1)

This is certainly an interesting puzzle. However, the rules did not sufficiently bound the problem - hence, there can be multiple correct answers.

Given the comment added -
> Okay, let's try these more hints...
> - The numbers in the first and third pentagons have nothing to do with each other but have something to do with the numbers in the middle one.
> - The numbers in the same corner of first and third pentagon forms a formula that leads to the number in the same corner of the middle pentagon. For example, number 6 in first pentagon and number 4 on third pentagon when entered into a formula will lead to number 22 in the middle pentagon. You just have to figure out the formula...

But, first of all, they were given as "hints" and "for example" only.

The rules are -
> Simple rules:
> - Comment with your number and the explanation on how you came up with such number.
> - The explanation should indeed result ~~to~~ [in] the correct number. Otherwise, the whole answer is not valid even if the number is correct.
> - The explanation should have a logical sense or sequence. It can not be that you just draw a number from the air.

So, I am taking the last rule as my starting point -
> - The explanation should have a logical sense or sequence.

Let me apply this to all three viable answers although no one provided "the explanation [in a complete and] a logical sense or sequence."
Assumptions:
- this is an algebraic problem
-  the "left-hand side" (of the equal sign or '=') numbers come from P1 (left-hand side pentagon) and P3 (right-hand side pentagon)
- P2 (pentagon in the center) holds the answer
- at least one number in the corresponding corner (vertice) of P1 and P3 is used in the equation that gives the calculated value in the corresponding vertice of P2
- the only operators are multiply, add, and subtract

Not bounded or limited by any rules, hints, or examples -
- how many equations?
- how many operators in each equation?
- how many variables in each equation?
- how many variables from each of P1 and P3 can be used in each equation?

Now, the implied rules or bounding rules for the approach used in the answer by @softwaricho are -

Bounding rules
- how many equations? **_only 1_**
- how many operators in each equation? **_bound not known; used two only_**
- how many variables in each equation? **_only 2_**
- how many variables from each of P1 and P3 can be used in each equation? **_only 1_**

For the answer by @romeliagarcia -
Bounding rules
- how many equations? **_only 1 stated although shown as 3_**
- how many operators in each equation? **_bound not known; used two only_**
- how many variables in each equation? **_up to 4_**
- how many variables from each of P1 and P3 can be used in each equation? **_up to 2_**

My rules are clearly stated and for the following -
Bounding rules
- how many equations? **_3_**
- how many operators in each equation? **_3_**
- how many variables in each equation? **_3_** (total of 5 variables in 3 equations)
- how many variables from each of P1 and P3 can be used in each equation? **_1 or 2_**

PLUS - I used "vector mathematics -
- left to right is the multiplication
- top to bottom in the same pentagon is  to subtract but from P3 to P1 is to add
- lower (bottom) to higher (upper) in the same pentagon is to add

Hola 

I checked out the hint but still can't figure it out 

Any help?

I feel like I'm cheating but I think @softwaricho has the formula figured out. 

You multiply the numbers in the first and third pentagon, add the number in the third pentagon and  and subtract the number in the first pentagon 

Using that formula, X = 9

Blessings

10?


a clue, please.

The three pentagons have the same formula?

Oh my god, you have me checking out hahaha

It will be 14, that is:
7 x 2 = 14 then -
5 x1= 5
14 - 5 = 9.


The numbers of the pentagon 1 and 3, have as a result the numbers of the 2 pentagon?

I've been seeing this pentagons for long time. Looking for a secuence. Sums, prime numbers, dates, letters. But I still don't get it.

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It's unethical to do, what you just did...
You have no right to post a link in message section...
If you are so concerned about it...you should not vote on it and let the moderators/system decide it!!!
I am trying to make honest living here.