Can you replace the question mark with the correct letter?

6 + 6 + 6 = N
7 + 7 + 7 = E
8 + 8 + 8 = R
0 + 0 + 0 = ?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

A horse was tied to a rope 5 meters long and the horses food was 15 meters away from the horse. How did the horse reach the food?

What runs around the whole yard without moving?

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

Jack was having a candle light dinner with his girlfriend. Suddenly a cold gush of wind entered through the open window and three of the ten candles were extinguished. Assuming that none of the other candles were extinguished.

How many candles are they left with in the end ?

If an electric train is travelling south, then which way is the smoke going?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

What has many teeth, but cannot bite?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?