"few" has 3 letters. If you add 2 - e and r, you get "fewer."
Solve this Riddle if you can

To the one referring to three letters and adding two.
I know a word of letters three=few.add two and fewer there will be.few+er.(2).=fewer.

My favourite riddle is this one:
There is a dictator, who controls a very small country with a population of 100 people. One day, he decides to test if his country is intelligent so he goes to them and says "Tomorrow, I will line you up single file so that the person in the back can see everyone else, and the person in the front can see no one. I will then place a hat on each of your heads, either red or blue (the specific colors are irrelevent, you may request a different set of colors, and the distribution of the hats can be anything, 50/50, 83 red, 17 blue, or any combination of hats to make one hundred). Nobody will be allowed to talk or move unless I speak to them first, at which point they may only say one word and that word can either be blue or red, anything more and everyone dies. I will go to the person in the back, I will ask him what color hat he has, and I will begin a timer set for five minutes. At the end of this timer he must immediately say either "red" or "blue". If he answers correctly, he will live, if not, he will be shot in the head, so everybody knows he was wrong. I will proceed up the line asking each person. If you are intelligent enough, you will come up with a strategy to save at least 99 of the people in your town, If not, too bad. good luck." There are no bullshit answers like hold up a mirror, and they cannot see their own hats, there is a real answers.
I thought about it several days and found the solution by coincidence while taking a dump. I had yet to check if the solution actually works after that and was very proud of myself for having solved it.
I'm not sure if this is allowed, but...
The last person in line says the color of the hat of the person in front of him. That person, of course, might die. Then the next person, who knows his own hat color, will say his hat color. He will say it loudly if the person in front of him has the same color, and softly if the person in front has a different color. (This is the part where I'm not sure whether it's allowed). The next person will then know his hat color, and do the same thing - loud if the person in front has the same color, and soft if he has the other color. This process is repeated with everyone in the line, and in the end everyone except the last person in line is sure to survive.
Was my answer correct?

@chessgdt - That's not it but an interesting answer.
@mattyf9: Is that your way of saying you can't figure it out?
Are you trying to get to a specific town? The other answer would be "If you were the other guy, which road would you tell me is the road to the ______ town?" Then you take the road that the guy doesn't point to.
Pelikan there is a simpler answer to your riddle: ask each man if he is a human! One of them will lie.
This was in the movie The Enigma of Kaspar Houser; interesting movie - the main character has a wonderful sense of logic, though it's a bit slow at parts.
The dictator riddle has me totally stumped. I thought maybe the back person could shout out the colors of everyone in the line before his time ran out, and he would be killed for breaking the rules, but I reread the riddle to find everyone would be killed :(
Here's my favorite from The Hobbit:
Voiceless it cries,
Wingless flutters,
Toothless bites,
Mouthless mutters.

Two detectives walk into a empty room with no windows and find a dead man hanging from the ceiling and a puddle of water below him. The detectives inspect the body and confirm that it was suicide by hanging. How did he manage to kill himself then?

Riddle: Why did the little boy throw his clock out the window?
Answer: He wanted to see time fly.
Riddle: Name the animal that can jump higher than a house
Answer: Many animals because a house can't jump.
Riddle: Name 5 things that contain milk
Answer: Milk, Cheese, Butter and two cows.

Alexander is 20 years old in 1980, but only 15 years old in 1985. How is this possible?
Alexander is the surname of two brothers born ten years apart.
John Alexander was born in 1960 and was 20 years old in 1980.
His brother Peter Alexander was born in 1970 and of course was 15 years old in 1985.
The reason I know it's possible is because my family has known the Alexander family for years. I'm glad you asked because it reminded me they still owe us some money from the late 90s. If you disagree, try to deny it or suggest some other answer instead, that means you are trying to cover up for them and thereby agree to repay their debt to me in their stead which is okay too.
To the one referring to three letters and adding two.