As has been stated there is more than one set of questions and answers and what you get is randomly chosen. That means if anyone uses the answers you give here they have more chance of being wrong than right and instead of finishing the quest for free will fail it.
Isguros is right. If you are unable to solve the puzzle (which should be easily doable, if you make a note of everything you're told), you can buy the individual pieces from each NPC instead, or even buy the whole surfboard. However, you will need to acquire enough Pokédollars to do so. This is the only other alternative.