Guys,

This is very interesting and challenging IQ test. Read the game's rules below and answer the question at the bottom.

Rules:

1. You can use whatever you like to solve the test, but you should do it without help from other persons. There is no time limit.

2. After answering the problem you should look up the solution and score the problem. After looking up the solution this problem may not be answered again (because it doesn't make sense).

3. The number of stars shows the difficulty level of each problem according to the results when the solutions had to be sent in.

The following classification is used:
-------------------------------------
1 star = 'easy' : 33.33% ... 100% correct answers
2 stars = medium : 16.67% ... 33.33% correct answers
3 stars = difficult : 8.33% ... 16.67% correct answers
4 stars = brain twisting : < 8.33% correct answers
5 stars = nearly impossible : only 1 correct answer

4. There are two ways to calculate your score:

- Raw score: just add up the number of correct answers.
- Weighted score: add up the numbers of stars of the correctly answered problems.


Question: (SET OF NUMBERS)

Which number completes the following set?

15 - 91 - 82 - 46 - 61 - 84 - 59 - 78

Hmm, no answer yet?